diff --git a/core/modules/edit/lib/Drupal/edit/EditController.php b/core/modules/edit/lib/Drupal/edit/EditController.php
index 1e62ab6c379..45c63ac8231 100644
--- a/core/modules/edit/lib/Drupal/edit/EditController.php
+++ b/core/modules/edit/lib/Drupal/edit/EditController.php
@@ -161,14 +161,15 @@ class EditController implements ContainerInjectionInterface {
         throw new NotFoundHttpException();
       }
 
+      $entity = $entity->getTranslation($langcode);
+
       // If the entity information for this field is requested, include it.
       $entity_id = $entity->entityType() . '/' . $entity_id;
       if (is_array($entities) && in_array($entity_id, $entities) && !isset($metadata[$entity_id])) {
-        $metadata[$entity_id] = $this->metadataGenerator->generateEntity($entity, $langcode);
+        $metadata[$entity_id] = $this->metadataGenerator->generateEntityMetadata($entity);
       }
 
-      $field_definition = $entity->get($field_name)->getFieldDefinition();
-      $metadata[$field] = $this->metadataGenerator->generateField($entity, $field_definition, $langcode, $view_mode);
+      $metadata[$field] = $this->metadataGenerator->generateFieldMetadata($entity->get($field_name), $view_mode);
     }
 
     return new JsonResponse($metadata);
diff --git a/core/modules/edit/lib/Drupal/edit/EditPluginInterface.php b/core/modules/edit/lib/Drupal/edit/EditPluginInterface.php
index 0228c2fbf65..59cac9a5a30 100644
--- a/core/modules/edit/lib/Drupal/edit/EditPluginInterface.php
+++ b/core/modules/edit/lib/Drupal/edit/EditPluginInterface.php
@@ -8,7 +8,7 @@
 namespace Drupal\edit;
 
 use Drupal\Component\Plugin\PluginInspectionInterface;
-use Drupal\Core\Field\FieldDefinitionInterface;
+use Drupal\Core\Field\FieldItemListInterface;
 
 /**
  * Defines an interface for in-place editors plugins.
@@ -16,17 +16,15 @@ use Drupal\Core\Field\FieldDefinitionInterface;
 interface EditPluginInterface extends PluginInspectionInterface {
 
   /**
-   * Checks whether this editor is compatible with a given field instance.
+   * Checks whether this in-place editor is compatible with a given field.
    *
-   * @param \Drupal\Core\Field\FieldDefinitionInterface $field_definition
-   *   The field definition of the field being edited.
-   * @param array $items
-   *   The field's item values.
+   * @param \Drupal\Core\Field\FieldItemListInterface $items
+   *   The field values to be in-place edited.
    *
    * @return bool
    *   TRUE if it is compatible, FALSE otherwise.
    */
-  public function isCompatible(FieldDefinitionInterface $field_definition, array $items);
+  public function isCompatible(FieldItemListInterface $items);
 
   /**
    * Generates metadata that is needed specifically for this editor.
@@ -34,16 +32,14 @@ interface EditPluginInterface extends PluginInspectionInterface {
    * Will only be called by \Drupal\edit\MetadataGeneratorInterface::generate()
    * when the passed in field instance & item values will use this editor.
    *
-   * @param \Drupal\Core\Field\FieldDefinitionInterface $field_definition
-   *   The field definition of the field being edited.
-   * @param array $items
-   *   The field's item values.
+   * @param \Drupal\Core\Field\FieldItemListInterface $items
+   *   The field values to be in-place edited.
    *
    * @return array
    *   A keyed array with metadata. Each key should be prefixed with the plugin
    *   ID of the editor.
    */
-  public function getMetadata(FieldDefinitionInterface $field_definition, array $items);
+  public function getMetadata(FieldItemListInterface $items);
 
   /**
    * Returns the attachments for this editor.
diff --git a/core/modules/edit/lib/Drupal/edit/EditorBase.php b/core/modules/edit/lib/Drupal/edit/EditorBase.php
index ca8dab6b7ee..20313d5359a 100644
--- a/core/modules/edit/lib/Drupal/edit/EditorBase.php
+++ b/core/modules/edit/lib/Drupal/edit/EditorBase.php
@@ -9,7 +9,7 @@ namespace Drupal\edit;
 
 use Drupal\Core\Plugin\PluginBase;
 use Drupal\edit\EditPluginInterface;
-use Drupal\Core\Field\FieldDefinitionInterface;
+use Drupal\Core\Field\FieldItemListInterface;
 
 /**
  * Defines a base editor implementation.
@@ -19,7 +19,7 @@ abstract class EditorBase extends PluginBase implements EditPluginInterface {
   /**
    * {@inheritdoc}
    */
-  function getMetadata(FieldDefinitionInterface $field_definition, array $items) {
+  function getMetadata(FieldItemListInterface $items) {
     return array();
   }
 
diff --git a/core/modules/edit/lib/Drupal/edit/EditorSelector.php b/core/modules/edit/lib/Drupal/edit/EditorSelector.php
index e21ef1ad6bf..9b4b9f972c2 100644
--- a/core/modules/edit/lib/Drupal/edit/EditorSelector.php
+++ b/core/modules/edit/lib/Drupal/edit/EditorSelector.php
@@ -9,7 +9,7 @@ namespace Drupal\edit;
 
 use Drupal\Component\Plugin\PluginManagerInterface;
 use Drupal\Component\Utility\NestedArray;
-use Drupal\Core\Field\FieldDefinitionInterface;
+use Drupal\Core\Field\FieldItemListInterface;
 use Drupal\Core\Field\FormatterPluginManager;
 
 /**
@@ -54,7 +54,7 @@ class EditorSelector implements EditorSelectorInterface {
   /**
    * {@inheritdoc}
    */
-  public function getEditor($formatter_type, FieldDefinitionInterface $field_definition, array $items) {
+  public function getEditor($formatter_type, FieldItemListInterface $items) {
     // Build a static cache of the editors that have registered themselves as
     // alternatives to a certain editor.
     if (!isset($this->alternatives)) {
@@ -91,7 +91,7 @@ class EditorSelector implements EditorSelectorInterface {
     // Make a choice.
     foreach ($editor_choices as $editor_id) {
       $editor = $this->editorManager->createInstance($editor_id);
-      if ($editor->isCompatible($field_definition, $items)) {
+      if ($editor->isCompatible($items)) {
         return $editor_id;
       }
     }
diff --git a/core/modules/edit/lib/Drupal/edit/EditorSelectorInterface.php b/core/modules/edit/lib/Drupal/edit/EditorSelectorInterface.php
index 28fb6d2cb98..c9f249e1d4c 100644
--- a/core/modules/edit/lib/Drupal/edit/EditorSelectorInterface.php
+++ b/core/modules/edit/lib/Drupal/edit/EditorSelectorInterface.php
@@ -7,7 +7,7 @@
 
 namespace Drupal\edit;
 
-use Drupal\Core\Field\FieldDefinitionInterface;
+use Drupal\Core\Field\FieldItemListInterface;
 
 /**
  * Interface for selecting an in-place editor (an Editor plugin) for a field.
@@ -19,15 +19,13 @@ interface EditorSelectorInterface {
    *
    * @param string $formatter_type
    *   The field's formatter type name.
-   * @param \Drupal\Core\Field\FieldDefinitionInterface $instance
-   *   The field definition.
-   * @param array $items
-   *   The field's item values.
+   * @param \Drupal\Core\Field\FieldItemListInterface $items
+   *   The field values to be in-place edited.
    *
    * @return string|null
    *   The editor to use, or NULL to not enable in-place editing.
    */
-  public function getEditor($formatter_type, FieldDefinitionInterface $instance, array $items);
+  public function getEditor($formatter_type, FieldItemListInterface $items);
 
   /**
    * Returns the attachments for all editors.
diff --git a/core/modules/edit/lib/Drupal/edit/MetadataGenerator.php b/core/modules/edit/lib/Drupal/edit/MetadataGenerator.php
index 4f18ed4cb9f..eac10973312 100644
--- a/core/modules/edit/lib/Drupal/edit/MetadataGenerator.php
+++ b/core/modules/edit/lib/Drupal/edit/MetadataGenerator.php
@@ -7,9 +7,9 @@
 
 namespace Drupal\edit;
 
-use Drupal\Core\Entity\EntityInterface;
 use Drupal\Component\Plugin\PluginManagerInterface;
-use Drupal\Core\Field\FieldDefinitionInterface;
+use Drupal\Core\Entity\EntityInterface;
+use Drupal\Core\Field\FieldItemListInterface;
 use Drupal\edit\Access\EditEntityFieldAccessCheckInterface;
 use Drupal\field\FieldInstanceInterface;
 
@@ -58,17 +58,18 @@ class MetadataGenerator implements MetadataGeneratorInterface {
   /**
    * {@inheritdoc}
    */
-  public function generateEntity(EntityInterface $entity, $langcode) {
+  public function generateEntityMetadata(EntityInterface $entity) {
     return array(
-      'label' => $entity->label($langcode),
+      'label' => $entity->label(),
     );
   }
 
   /**
    * {@inheritdoc}
    */
-  public function generateField(EntityInterface $entity, FieldDefinitionInterface $field_definition, $langcode, $view_mode) {
-    $field_name = $field_definition->getName();
+  public function generateFieldMetadata(FieldItemListInterface $items, $view_mode) {
+    $entity = $items->getEntity();
+    $field_name = $items->getFieldDefinition()->getName();
 
     // Early-return if user does not have access.
     $access = $this->accessChecker->accessEditEntityField($entity, $field_name);
@@ -78,14 +79,13 @@ class MetadataGenerator implements MetadataGeneratorInterface {
 
     // Early-return if no editor is available.
     $formatter_id = entity_get_render_display($entity, $view_mode)->getRenderer($field_name)->getPluginId();
-    $items = $entity->getTranslation($langcode)->get($field_name)->getValue();
-    $editor_id = $this->editorSelector->getEditor($formatter_id, $field_definition, $items);
+    $editor_id = $this->editorSelector->getEditor($formatter_id, $items);
     if (!isset($editor_id)) {
       return array('access' => FALSE);
     }
 
     // Gather metadata, allow the editor to add additional metadata of its own.
-    $label = $field_definition->getLabel();
+    $label = $items->getFieldDefinition()->getLabel();
     $editor = $this->editorManager->createInstance($editor_id);
     $metadata = array(
       'label' => check_plain($label),
@@ -93,7 +93,7 @@ class MetadataGenerator implements MetadataGeneratorInterface {
       'editor' => $editor_id,
       'aria' => t('Entity @type @id, field @field', array('@type' => $entity->entityType(), '@id' => $entity->id(), '@field' => $label)),
     );
-    $custom_metadata = $editor->getMetadata($field_definition, $items);
+    $custom_metadata = $editor->getMetadata($items);
     if (count($custom_metadata)) {
       $metadata['custom'] = $custom_metadata;
     }
diff --git a/core/modules/edit/lib/Drupal/edit/MetadataGeneratorInterface.php b/core/modules/edit/lib/Drupal/edit/MetadataGeneratorInterface.php
index 6cde4dde9dd..b3a38333eaa 100644
--- a/core/modules/edit/lib/Drupal/edit/MetadataGeneratorInterface.php
+++ b/core/modules/edit/lib/Drupal/edit/MetadataGeneratorInterface.php
@@ -8,7 +8,7 @@
 namespace Drupal\edit;
 
 use Drupal\Core\Entity\EntityInterface;
-use Drupal\Core\Field\FieldDefinitionInterface;
+use Drupal\Core\Field\FieldItemListInterface;
 
 /**
  * Interface for generating in-place editing metadata.
@@ -19,24 +19,18 @@ interface MetadataGeneratorInterface {
    * Generates in-place editing metadata for an entity.
    *
    * @param \Drupal\Core\Entity\EntityInterface $entity
-   *   The entity being edited.
-   * @param string $langcode
-   *   The name of the language for which the field is being edited.
+   *   The entity, in the language in which one of its fields is being edited.
    * @return array
    *   An array containing metadata with the following keys:
    *   - label: the user-visible label for the entity in the given language.
    */
-  public function generateEntity(EntityInterface $entity, $langcode);
+  public function generateEntityMetadata(EntityInterface $entity);
 
   /**
    * Generates in-place editing metadata for an entity field.
    *
-   * @param \Drupal\Core\Entity\EntityInterface $entity
-   *   The entity being edited.
-   * @param \Drupal\Core\Field\FieldDefinitionInterface $field_definition
-   *   The field definition of the field being edited.
-   * @param string $langcode
-   *   The name of the language for which the field is being edited.
+   * @param \Drupal\Core\Field\FieldItemListInterface $items
+   *   The field values to be in-place edited.
    * @param string $view_mode
    *   The view mode the field should be rerendered in.
    * @return array
@@ -47,6 +41,6 @@ interface MetadataGeneratorInterface {
    *   - aria: the ARIA label.
    *   - custom: (optional) any additional metadata that the editor provides.
    */
-  public function generateField(EntityInterface $entity, FieldDefinitionInterface $field_definition, $langcode, $view_mode);
+  public function generateFieldMetadata(FieldItemListInterface $items, $view_mode);
 
 }
diff --git a/core/modules/edit/lib/Drupal/edit/Plugin/InPlaceEditor/FormEditor.php b/core/modules/edit/lib/Drupal/edit/Plugin/InPlaceEditor/FormEditor.php
index 1f969a693b6..756cf24362f 100644
--- a/core/modules/edit/lib/Drupal/edit/Plugin/InPlaceEditor/FormEditor.php
+++ b/core/modules/edit/lib/Drupal/edit/Plugin/InPlaceEditor/FormEditor.php
@@ -7,8 +7,8 @@
 
 namespace Drupal\edit\Plugin\InPlaceEditor;
 
+use Drupal\Core\Field\FieldItemListInterface;
 use Drupal\edit\EditorBase;
-use Drupal\Core\Field\FieldDefinitionInterface;
 
 /**
  * Defines the form in-place editor.
@@ -22,7 +22,7 @@ class FormEditor extends EditorBase {
   /**
    * {@inheritdoc}
    */
-  function isCompatible(FieldDefinitionInterface $field_definition, array $items) {
+  public function isCompatible(FieldItemListInterface $items) {
     return TRUE;
   }
 
diff --git a/core/modules/edit/lib/Drupal/edit/Plugin/InPlaceEditor/PlainTextEditor.php b/core/modules/edit/lib/Drupal/edit/Plugin/InPlaceEditor/PlainTextEditor.php
index c17e30409d5..a36b2ce2373 100644
--- a/core/modules/edit/lib/Drupal/edit/Plugin/InPlaceEditor/PlainTextEditor.php
+++ b/core/modules/edit/lib/Drupal/edit/Plugin/InPlaceEditor/PlainTextEditor.php
@@ -7,8 +7,8 @@
 
 namespace Drupal\edit\Plugin\InPlaceEditor;
 
+use Drupal\Core\Field\FieldItemListInterface;
 use Drupal\edit\EditorBase;
-use Drupal\Core\Field\FieldDefinitionInterface;
 
 /**
  * Defines the plain text in-place editor.
@@ -25,7 +25,9 @@ class PlainTextEditor extends EditorBase {
    * @todo The processed text logic is too coupled to text fields. Figure out
    *   how to generalize to other textual field types.
    */
-  function isCompatible(FieldDefinitionInterface $field_definition, array $items) {
+  public function isCompatible(FieldItemListInterface $items) {
+    $field_definition = $items->getFieldDefinition();
+
     // This editor is incompatible with multivalued fields.
     if ($field_definition->getCardinality() != 1) {
       return FALSE;
diff --git a/core/modules/edit/lib/Drupal/edit/Tests/EditorSelectionTest.php b/core/modules/edit/lib/Drupal/edit/Tests/EditorSelectionTest.php
index 8c290ad6a17..7a12d54d157 100644
--- a/core/modules/edit/lib/Drupal/edit/Tests/EditorSelectionTest.php
+++ b/core/modules/edit/lib/Drupal/edit/Tests/EditorSelectionTest.php
@@ -7,6 +7,7 @@
 
 namespace Drupal\edit\Tests;
 
+use Drupal\Core\Language\Language;
 use Drupal\edit\Plugin\InPlaceEditorManager;
 use Drupal\edit\EditorSelector;
 
@@ -45,13 +46,13 @@ class EditorSelectionTest extends EditTestBase {
   }
 
   /**
-   * Retrieves the FieldInstance object for the given field and returns the
-   * editor that Edit selects.
+   * Returns the in-place editor that Edit selects.
    */
-  protected function getSelectedEditor($items, $field_name, $view_mode = 'default') {
+  protected function getSelectedEditor($entity_id, $field_name, $view_mode = 'default') {
+    $entity = entity_load('entity_test', $entity_id, TRUE);
+    $items = $entity->getTranslation(Language::LANGCODE_NOT_SPECIFIED)->get($field_name);
     $options = entity_get_display('entity_test', 'entity_test', $view_mode)->getComponent($field_name);
-    $field_instance = field_info_instance('entity_test', $field_name, 'entity_test');
-    return $this->editorSelector->getEditor($options['type'], $field_instance, $items);
+    return $this->editorSelector->getEditor($options['type'], $items);
   }
 
   /**
@@ -72,32 +73,34 @@ class EditorSelectionTest extends EditTestBase {
       array()
     );
 
-    // Pretend there is an entity with these items for the field.
-    $items = array(array('value' => 'Hello, world!', 'format' => 'full_html'));
+    // Create an entity with values for this text field.
+    $this->entity = entity_create('entity_test', array());
+    $this->entity->{$field_name}->value = 'Hello, world!';
+    $this->entity->{$field_name}->format = 'full_html';
+    $this->entity->save();
 
     // Editor selection without text processing, with cardinality 1.
-    $this->assertEqual('plain_text', $this->getSelectedEditor($items, $field_name), "Without text processing, cardinality 1, the 'plain_text' editor is selected.");
+    $this->assertEqual('plain_text', $this->getSelectedEditor($this->entity->id(), $field_name), "Without text processing, cardinality 1, the 'plain_text' editor is selected.");
 
     // Editor selection with text processing, cardinality 1.
     $this->field_text_instance->settings['text_processing'] = 1;
     $this->field_text_instance->save();
-    $this->assertEqual('form', $this->getSelectedEditor($items, $field_name), "With text processing, cardinality 1, the 'form' editor is selected.");
+    $this->assertEqual('form', $this->getSelectedEditor($this->entity->id(), $field_name), "With text processing, cardinality 1, the 'form' editor is selected.");
 
     // Editor selection without text processing, cardinality 1 (again).
     $this->field_text_instance->settings['text_processing'] = 0;
     $this->field_text_instance->save();
-    $this->assertEqual('plain_text', $this->getSelectedEditor($items, $field_name), "Without text processing again, cardinality 1, the 'plain_text' editor is selected.");
+    $this->assertEqual('plain_text', $this->getSelectedEditor($this->entity->id(), $field_name), "Without text processing again, cardinality 1, the 'plain_text' editor is selected.");
 
     // Editor selection without text processing, cardinality >1
     $this->field_text_field->cardinality = 2;
     $this->field_text_field->save();
-    $items[] = array('value' => 'Hallo, wereld!', 'format' => 'full_html');
-    $this->assertEqual('form', $this->getSelectedEditor($items, $field_name), "Without text processing, cardinality >1, the 'form' editor is selected.");
+    $this->assertEqual('form', $this->getSelectedEditor($this->entity->id(), $field_name), "Without text processing, cardinality >1, the 'form' editor is selected.");
 
     // Editor selection with text processing, cardinality >1
     $this->field_text_instance->settings['text_processing'] = 1;
     $this->field_text_instance->save();
-    $this->assertEqual('form', $this->getSelectedEditor($items, $field_name), "With text processing, cardinality >1, the 'form' editor is selected.");
+    $this->assertEqual('form', $this->getSelectedEditor($this->entity->id(), $field_name), "With text processing, cardinality >1, the 'form' editor is selected.");
   }
 
   /**
@@ -122,21 +125,24 @@ class EditorSelectionTest extends EditTestBase {
       array()
     );
 
-    // Pretend there is an entity with these items for the field.
-    $items = array(array('value' => 'Hello, world!', 'format' => 'filtered_html'));
+    // Create an entity with values for this text field.
+    $this->entity = entity_create('entity_test', array());
+    $this->entity->{$field_name}->value = 'Hello, world!';
+    $this->entity->{$field_name}->format = 'filtered_html';
+    $this->entity->save();
 
     // Editor selection w/ cardinality 1, text format w/o associated text editor.
-    $this->assertEqual('form', $this->getSelectedEditor($items, $field_name), "With cardinality 1, and the filtered_html text format, the 'form' editor is selected.");
+    $this->assertEqual('form', $this->getSelectedEditor($this->entity->id(), $field_name), "With cardinality 1, and the filtered_html text format, the 'form' editor is selected.");
 
     // Editor selection w/ cardinality 1, text format w/ associated text editor.
-    $items[0]['format'] = 'full_html';
-    $this->assertEqual('wysiwyg', $this->getSelectedEditor($items, $field_name), "With cardinality 1, and the full_html text format, the 'wysiwyg' editor is selected.");
+    $this->entity->{$field_name}->format = 'full_html';
+    $this->entity->save();
+    $this->assertEqual('wysiwyg', $this->getSelectedEditor($this->entity->id(), $field_name), "With cardinality 1, and the full_html text format, the 'wysiwyg' editor is selected.");
 
     // Editor selection with text processing, cardinality >1
     $this->field_textarea_field->cardinality = 2;
     $this->field_textarea_field->save();
-    $items[] = array('value' => 'Hallo, wereld!', 'format' => 'full_html');
-    $this->assertEqual('form', $this->getSelectedEditor($items, $field_name), "With cardinality >1, and both items using the full_html text format, the 'form' editor is selected.");
+    $this->assertEqual('form', $this->getSelectedEditor($this->entity->id(), $field_name), "With cardinality >1, and both items using the full_html text format, the 'form' editor is selected.");
   }
 
   /**
@@ -156,16 +162,18 @@ class EditorSelectionTest extends EditTestBase {
       array()
     );
 
-    // Pretend there is an entity with these items for the field.
-    $items = array(42, 43);
+    // Create an entity with values for this text field.
+    $this->entity = entity_create('entity_test', array());
+    $this->entity->{$field_name}->value = 42;
+    $this->entity->save();
 
     // Editor selection with cardinality 1.
-    $this->assertEqual('form', $this->getSelectedEditor($items, $field_name), "With cardinality 1, the 'form' editor is selected.");
+    $this->assertEqual('form', $this->getSelectedEditor($this->entity->id(), $field_name), "With cardinality 1, the 'form' editor is selected.");
 
     // Editor selection with cardinality >1.
     $this->field_nr_field->cardinality = 2;
     $this->field_nr_field->save();
-    $this->assertEqual('form', $this->getSelectedEditor($items, $field_name), "With cardinality >1, the 'form' editor is selected.");
+    $this->assertEqual('form', $this->getSelectedEditor($this->entity->id(), $field_name), "With cardinality >1, the 'form' editor is selected.");
   }
 
 }
diff --git a/core/modules/edit/lib/Drupal/edit/Tests/MetadataGeneratorTest.php b/core/modules/edit/lib/Drupal/edit/Tests/MetadataGeneratorTest.php
index c7f82e076c0..3b7f7f6057e 100644
--- a/core/modules/edit/lib/Drupal/edit/Tests/MetadataGeneratorTest.php
+++ b/core/modules/edit/lib/Drupal/edit/Tests/MetadataGeneratorTest.php
@@ -96,15 +96,14 @@ class MetadataGeneratorTest extends EditTestBase {
 
     // Create an entity with values for this text field.
     $this->entity = entity_create('entity_test', array());
-    $this->is_new = TRUE;
     $this->entity->{$field_1_name}->value = 'Test';
     $this->entity->{$field_2_name}->value = 42;
     $this->entity->save();
     $entity = entity_load('entity_test', $this->entity->id());
 
     // Verify metadata for field 1.
-    $instance_1 = field_info_instance($entity->entityType(), $field_1_name, $entity->bundle());
-    $metadata_1 = $this->metadataGenerator->generateField($entity, $instance_1, Language::LANGCODE_NOT_SPECIFIED, 'default');
+    $items_1 = $entity->getTranslation(Language::LANGCODE_NOT_SPECIFIED)->get($field_1_name);
+    $metadata_1 = $this->metadataGenerator->generateFieldMetadata($items_1, 'default');
     $expected_1 = array(
       'access' => TRUE,
       'label' => 'Simple text field',
@@ -114,8 +113,8 @@ class MetadataGeneratorTest extends EditTestBase {
     $this->assertEqual($expected_1, $metadata_1, 'The correct metadata is generated for the first field.');
 
     // Verify metadata for field 2.
-    $instance_2 = field_info_instance($entity->entityType(), $field_2_name, $entity->bundle());
-    $metadata_2 = $this->metadataGenerator->generateField($entity, $instance_2, Language::LANGCODE_NOT_SPECIFIED, 'default');
+    $items_2 = $entity->getTranslation(Language::LANGCODE_NOT_SPECIFIED)->get($field_2_name);
+    $metadata_2 = $this->metadataGenerator->generateFieldMetadata($items_2, 'default');
     $expected_2 = array(
       'access' => TRUE,
       'label' => 'Simple number field',
@@ -169,8 +168,8 @@ class MetadataGeneratorTest extends EditTestBase {
     $entity = entity_load('entity_test', $this->entity->id());
 
     // Verify metadata.
-    $instance = field_info_instance($entity->entityType(), $field_name, $entity->bundle());
-    $metadata = $this->metadataGenerator->generateField($entity, $instance, Language::LANGCODE_NOT_SPECIFIED, 'default');
+    $items = $entity->getTranslation(Language::LANGCODE_NOT_SPECIFIED)->get($field_name);
+    $metadata = $this->metadataGenerator->generateFieldMetadata($items, 'default');
     $expected = array(
       'access' => TRUE,
       'label' => 'Rich text field',
diff --git a/core/modules/edit/tests/modules/lib/Drupal/edit_test/Plugin/InPlaceEditor/WysiwygEditor.php b/core/modules/edit/tests/modules/lib/Drupal/edit_test/Plugin/InPlaceEditor/WysiwygEditor.php
index b286d66f5a2..d8dc40e3bc8 100644
--- a/core/modules/edit/tests/modules/lib/Drupal/edit_test/Plugin/InPlaceEditor/WysiwygEditor.php
+++ b/core/modules/edit/tests/modules/lib/Drupal/edit_test/Plugin/InPlaceEditor/WysiwygEditor.php
@@ -7,8 +7,8 @@
 
 namespace Drupal\edit_test\Plugin\InPlaceEditor;
 
+use Drupal\Core\Field\FieldItemListInterface;
 use Drupal\edit\EditorBase;
-use Drupal\Core\Field\FieldDefinitionInterface;
 
 /**
  * Defines the 'wysiwyg' in-place editor.
@@ -23,7 +23,9 @@ class WysiwygEditor extends EditorBase {
   /**
    * {@inheritdoc}
    */
-  function isCompatible(FieldDefinitionInterface $field_definition, array $items) {
+  public function isCompatible(FieldItemListInterface $items) {
+    $field_definition = $items->getFieldDefinition();
+
     // This editor is incompatible with multivalued fields.
     if ($field_definition->getCardinality() != 1) {
       return FALSE;
@@ -32,8 +34,7 @@ class WysiwygEditor extends EditorBase {
     // if there is a currently active text format and that text format is the
     // 'full_html' text format.
     elseif ($field_definition->getSetting('text_processing')) {
-      $format_id = $items[0]['format'];
-      if (isset($format_id) && $format_id === 'full_html') {
+      if ($items[0]->format === 'full_html') {
         return TRUE;
       }
       return FALSE;
@@ -43,9 +44,8 @@ class WysiwygEditor extends EditorBase {
   /**
    * {@inheritdoc}
    */
-  function getMetadata(FieldDefinitionInterface $field_definition, array $items) {
-    $format_id = $items[0]['format'];
-    $metadata['format'] = $format_id;
+  function getMetadata(FieldItemListInterface $items) {
+    $metadata['format'] = $items[0]->format;
     return $metadata;
   }
 
diff --git a/core/modules/editor/lib/Drupal/editor/Plugin/InPlaceEditor/Editor.php b/core/modules/editor/lib/Drupal/editor/Plugin/InPlaceEditor/Editor.php
index 2138b578b8e..b3ba3062d97 100644
--- a/core/modules/editor/lib/Drupal/editor/Plugin/InPlaceEditor/Editor.php
+++ b/core/modules/editor/lib/Drupal/editor/Plugin/InPlaceEditor/Editor.php
@@ -8,8 +8,8 @@
 namespace Drupal\editor\Plugin\InPlaceEditor;
 
 use Drupal\Component\Plugin\PluginBase;
+use Drupal\Core\Field\FieldItemListInterface;
 use Drupal\edit\EditPluginInterface;
-use Drupal\Core\Field\FieldDefinitionInterface;
 
 /**
  * Defines the formatted text in-place editor.
@@ -24,7 +24,9 @@ class Editor extends PluginBase implements EditPluginInterface {
   /**
    * {@inheritdoc}
    */
-  function isCompatible(FieldDefinitionInterface $field_definition, array $items) {
+  public function isCompatible(FieldItemListInterface $items) {
+    $field_definition = $items->getFieldDefinition();
+
     // This editor is incompatible with multivalued fields.
     if ($field_definition->getCardinality() != 1) {
       return FALSE;
@@ -33,8 +35,7 @@ class Editor extends PluginBase implements EditPluginInterface {
     // if there is a currently active text format, that text format has an
     // associated editor and that editor supports inline editing.
     elseif ($field_definition->getSetting('text_processing')) {
-      $format_id = $items[0]['format'];
-      if (isset($format_id) && $editor = editor_load($format_id)) {
+      if ($editor = editor_load($items[0]->format)) {
         $definition = \Drupal::service('plugin.manager.editor')->getDefinition($editor->editor);
         if ($definition['supports_inline_editing'] === TRUE) {
           return TRUE;
@@ -48,8 +49,8 @@ class Editor extends PluginBase implements EditPluginInterface {
   /**
    * {@inheritdoc}
    */
-  function getMetadata(FieldDefinitionInterface $field_definition, array $items) {
-    $format_id = $items[0]['format'];
+  function getMetadata(FieldItemListInterface $items) {
+    $format_id = $items[0]->format;
     $metadata['format'] = $format_id;
     $metadata['formatHasTransformations'] = $this->textFormatHasTransformationFilters($format_id);
     return $metadata;
diff --git a/core/modules/editor/lib/Drupal/editor/Tests/EditIntegrationTest.php b/core/modules/editor/lib/Drupal/editor/Tests/EditIntegrationTest.php
index 908129057fb..016a0ecf4bb 100644
--- a/core/modules/editor/lib/Drupal/editor/Tests/EditIntegrationTest.php
+++ b/core/modules/editor/lib/Drupal/editor/Tests/EditIntegrationTest.php
@@ -106,13 +106,13 @@ class EditIntegrationTest extends EditTestBase {
   }
 
   /**
-   * Retrieves the FieldInstance object for the given field and returns the
-   * editor that Edit selects.
+   * Returns the in-place editor that Edit selects.
    */
-  protected function getSelectedEditor($items, $field_name, $view_mode = 'default') {
+  protected function getSelectedEditor($entity_id, $field_name, $view_mode = 'default') {
+    $entity = entity_load('entity_test', $entity_id, TRUE);
+    $items = $entity->getTranslation(Language::LANGCODE_NOT_SPECIFIED)->get($field_name);
     $options = entity_get_display('entity_test', 'entity_test', $view_mode)->getComponent($field_name);
-    $field_instance = field_info_instance('entity_test', $field_name, 'entity_test');
-    return $this->editorSelector->getEditor($options['type'], $field_instance, $items);
+    return $this->editorSelector->getEditor($options['type'], $items);
   }
 
   /**
@@ -126,21 +126,24 @@ class EditIntegrationTest extends EditTestBase {
     $this->editorManager = new InPlaceEditorManager($this->container->get('container.namespaces'));
     $this->editorSelector = new EditorSelector($this->editorManager, $this->container->get('plugin.manager.field.formatter'));
 
-    // Pretend there is an entity with these items for the field.
-    $items = array(array('value' => 'Hello, world!', 'format' => 'filtered_html'));
+    // Create an entity with values for this text field.
+    $this->entity = entity_create('entity_test', array());
+    $this->entity->{$this->field_name}->value = 'Hello, world!';
+    $this->entity->{$this->field_name}->format = 'filtered_html';
+    $this->entity->save();
 
     // Editor selection w/ cardinality 1, text format w/o associated text editor.
-    $this->assertEqual('form', $this->getSelectedEditor($items, $this->field_name), "With cardinality 1, and the filtered_html text format, the 'form' editor is selected.");
+    $this->assertEqual('form', $this->getSelectedEditor($this->entity->id(), $this->field_name), "With cardinality 1, and the filtered_html text format, the 'form' editor is selected.");
 
     // Editor selection w/ cardinality 1, text format w/ associated text editor.
-    $items[0]['format'] = 'full_html';
-    $this->assertEqual('editor', $this->getSelectedEditor($items, $this->field_name), "With cardinality 1, and the full_html text format, the 'editor' editor is selected.");
+    $this->entity->{$this->field_name}->format = 'full_html';
+    $this->entity->save();
+    $this->assertEqual('editor', $this->getSelectedEditor($this->entity->id(), $this->field_name), "With cardinality 1, and the full_html text format, the 'editor' editor is selected.");
 
     // Editor selection with text processing, cardinality >1
     $this->field_textarea_field->cardinality = 2;
     $this->field_textarea_field->save();
-    $items[] = array('value' => 'Hallo, wereld!', 'format' => 'full_html');
-    $this->assertEqual('form', $this->getSelectedEditor($items, $this->field_name), "With cardinality >1, and both items using the full_html text format, the 'form' editor is selected.");
+    $this->assertEqual('form', $this->getSelectedEditor($this->entity->id(), $this->field_name), "With cardinality >1, and both items using the full_html text format, the 'form' editor is selected.");
   }
 
   /**
@@ -160,8 +163,8 @@ class EditIntegrationTest extends EditTestBase {
     $entity = entity_load('entity_test', $this->entity->id());
 
     // Verify metadata.
-    $instance = field_info_instance($entity->entityType(), $this->field_name, $entity->bundle());
-    $metadata = $this->metadataGenerator->generateField($entity, $instance, Language::LANGCODE_NOT_SPECIFIED, 'default');
+    $items = $entity->getTranslation(Language::LANGCODE_NOT_SPECIFIED)->get($this->field_name);
+    $metadata = $this->metadataGenerator->generateFieldMetadata($items, 'default');
     $expected = array(
       'access' => TRUE,
       'label' => 'Long text field',