My GlowLight 4 was updated overnight to this update version.
The screen said it provides the following (attachment for the specific language is included):
- Frequently Asked Questions added to Support section of the Settings screen.
- Custom sorting for shelves.
- Search notes and annotations.
- Bug fixes and performance improvements.
The FAQ section works, but it's a little finicky and weird. Custom sorting is neat but it looks pretty messy with how they implemented it. Picture of that is attached. The search for notes / annotations across all books is nice and I can confirm works for at least highlighted passages across both purchased NOOK content as well as sideloaded ePubs.
And a note: Good e-Reader cannot use these images in any of their news content, as they have in the past with images I've posted and shared about NOOK firmware updates.