Update release note for page editor redesign

SPONSORS.md

@@ -49,3 +49,5 @@ The features below were developed thanks to the sponsorship of these organsation
 - Automatic redirect creation - [The National Archives](https://www.nationalarchives.gov.uk)
 
 - Persistent IDs for ListBlock items - [NHS](https://www.nhs.uk/)
+
+- Page editor redesign - [Google](http://google.com/)

docs/releases/3.0.md

@@ -11,17 +11,22 @@ depth: 1
 
 ### Page editor redesign
 
-Here are other changes related to the redesign:
+This release contains significant UI changes that affect all of Wagtail's admin, largely driven by the implementation of the new Page Editor. These include:
 
- * Switch the Wagtail branding font to a system font stack (Steven Steinwand, Paarth Agarwal)
- * Remove most uppercased text styles from admin UI (Paarth Agarwal)
- * Convert all UI code to CSS logical properties for Right-to-Left (RTL) language support (Thibaud Colas)
  * Fully remove the legacy sidebar, with slim sidebar replacing it for all users (Thibaud Colas)
  * Add support for adding custom attributes for link menu items in the slim sidebar (Thibaud Colas)
- * Implement new slim page editor header with breadcrumb (Steven Steinwand, Karl Hobley)
+ * Convert all UI code to CSS logical properties for Right-to-Left (RTL) language support (Thibaud Colas)
+ * Switch the Wagtail branding font to a system font stack (Steven Steinwand, Paarth Agarwal)
+ * Remove most uppercased text styles from admin UI (Paarth Agarwal)
  * Implement new tabs design across the admin interface (Steven Steinwand)
+
+Other changes that are specific to the Page Editor include:
+
+ * Implement new slim page editor header with breadcrumb and secondary page menu (Steven Steinwand, Karl Hobley)
  * Move page meta information from the header to a new status side panel component inside of the page editing UI (Steven Steinwand, Karl Hobley)
 
+Further updates to the page editor are expected in the next release. Development on this feature was sponsored by Google.
+
 ### Removal of special-purpose field panel types
 
 The panel types `StreamFieldPanel`, `RichTextFieldPanel`, `ImageChooserPanel`, `DocumentChooserPanel` and `SnippetChooserPanel` have been phased out, and can now be replaced with `FieldPanel`. Additionally, `PageChooserPanel` is only required when passing a `page_type` or `can_choose_root`, and can otherwise be replaced with `FieldPanel`. In all cases, `FieldPanel` will now automatically select the most appropriate form element. This feature was developed by Matt Westcott.