diff -u b/core/lib/Drupal/Core/Routing/Access/AccessInterface.php b/core/lib/Drupal/Core/Routing/Access/AccessInterface.php
--- b/core/lib/Drupal/Core/Routing/Access/AccessInterface.php
+++ b/core/lib/Drupal/Core/Routing/Access/AccessInterface.php
@@ -16,4 +16,5 @@
 
   // @todo Remove this interface since it no longer defines any methods?
+  // @see https://drupal.org/node/2266817.
 
 }
diff -u b/core/modules/field_ui/lib/Drupal/field_ui/Access/FormModeAccessCheck.php b/core/modules/field_ui/lib/Drupal/field_ui/Access/FormModeAccessCheck.php
--- b/core/modules/field_ui/lib/Drupal/field_ui/Access/FormModeAccessCheck.php
+++ b/core/modules/field_ui/lib/Drupal/field_ui/Access/FormModeAccessCheck.php
@@ -45,9 +45,15 @@
    * @param \Drupal\Core\Session\AccountInterface $account
    *   The currently logged in account.
    * @param string $form_mode_name
-   *   The form mode.
+   *   (optional) The form mode. Defaults to 'default'.
    * @param string $bundle
-   *   The bundle.
+   *   (optional) The bundle. Different entity types can have different names
+   *   for their bundle key, so if not specified on the route via a {bundle}
+   *   parameter, the access checker determines the appropriate key name, and
+   *   gets the value from the corresponding request attribute. For example,
+   *   for nodes, the bundle key is "node_type", so the value would be
+   *   available via the {node_type} parameter rather than a {bundle}
+   *   parameter.
    *
    * @return string
    *   A \Drupal\Core\Access\AccessInterface constant value.
diff -u b/core/modules/field_ui/lib/Drupal/field_ui/Access/ViewModeAccessCheck.php b/core/modules/field_ui/lib/Drupal/field_ui/Access/ViewModeAccessCheck.php
--- b/core/modules/field_ui/lib/Drupal/field_ui/Access/ViewModeAccessCheck.php
+++ b/core/modules/field_ui/lib/Drupal/field_ui/Access/ViewModeAccessCheck.php
@@ -45,9 +45,15 @@
    * @param \Drupal\Core\Session\AccountInterface $account
    *   The currently logged in account.
    * @param string $view_mode_name
-   *   The view mode.
+   *   (optional) The view mode. Defaults to 'default'.
    * @param string $bundle
-   *   The bundle.
+   *   (optional) The bundle. Different entity types can have different names
+   *   for their bundle key, so if not specified on the route via a {bundle}
+   *   parameter, the access checker determines the appropriate key name, and
+   *   gets the value from the corresponding request attribute. For example,
+   *   for nodes, the bundle key is "node_type", so the value would be
+   *   available via the {node_type} parameter rather than a {bundle}
+   *   parameter.
    *
    * @return string
    *   A \Drupal\Core\Access\AccessInterface constant value.
diff -u b/core/modules/node/lib/Drupal/node/Access/NodeAddAccessCheck.php b/core/modules/node/lib/Drupal/node/Access/NodeAddAccessCheck.php
--- b/core/modules/node/lib/Drupal/node/Access/NodeAddAccessCheck.php
+++ b/core/modules/node/lib/Drupal/node/Access/NodeAddAccessCheck.php
@@ -40,7 +40,8 @@
    * @param \Drupal\Core\Session\AccountInterface $account
    *   The currently logged in account.
    * @param \Drupal\node\NodeTypeInterface $node_type
-   *   The node type.
+   *   (optional) The node type. If not specified, access is allowed if there
+   *   exists at least one node type for which the user may create a node.
    *
    * @return string
    *   A \Drupal\Core\Access\AccessInterface constant value.
diff -u b/core/modules/node/lib/Drupal/node/Access/NodeRevisionAccessCheck.php b/core/modules/node/lib/Drupal/node/Access/NodeRevisionAccessCheck.php
--- b/core/modules/node/lib/Drupal/node/Access/NodeRevisionAccessCheck.php
+++ b/core/modules/node/lib/Drupal/node/Access/NodeRevisionAccessCheck.php
@@ -68,15 +68,19 @@
    *   The route to check against.
    * @param \Drupal\Core\Session\AccountInterface $account
    *   The currently logged in account.
+   * @param int $node_revision
+   *   (optional) The node revision ID. If not specified, but $node is, access
+   *   is checked for that object's revision.
    * @param \Drupal\node\NodeInterface $node
-   *   The node.
-   * @param string $node_revision
-   *   The node revision.
+   *   (optional) A node object. Used for checking access to a node's default
+   *   revision when $node_revision is unspecified. Ignored when $node_revision
+   *   is specified. If neither $node_revision nor $node are specified, then
+   *   access is denied.
    *
    * @return string
    *   A \Drupal\Core\Access\AccessInterface constant value.
    */
-  public function access(Route $route, AccountInterface $account, NodeInterface $node = NULL, $node_revision = NULL) {
+  public function access(Route $route, AccountInterface $account, $node_revision = NULL, NodeInterface $node = NULL) {
     if ($node_revision) {
       $node = $this->nodeStorage->loadRevision($node_revision);
     }
diff -u b/core/modules/quickedit/lib/Drupal/quickedit/Access/EditEntityFieldAccessCheck.php b/core/modules/quickedit/lib/Drupal/quickedit/Access/EditEntityFieldAccessCheck.php
--- b/core/modules/quickedit/lib/Drupal/quickedit/Access/EditEntityFieldAccessCheck.php
+++ b/core/modules/quickedit/lib/Drupal/quickedit/Access/EditEntityFieldAccessCheck.php
@@ -51,7 +51,7 @@
    * @todo Replace $request parameter with $entity once
    *   https://drupal.org/node/1837388 is fixed.
    *
-   * @todo Use the $account argument.
+   * @todo Use the $account argument: https://drupal.org/node/2266809.
    */
   public function access(Request $request, $field_name, AccountInterface $account) {
     if (!$this->validateAndUpcastRequestAttributes($request)) {