An outline of the new features on the device from the Amazon Kindle Fire support page:
We have a new, free software update available for Kindle Fire HD 8.9”. The software update will be delivered wirelessly and includes several new features and performance enhancements:
Change your device language
Set your default device language to one of eight languages, including English (U.S.), English (U.K.), German, French, Italian, Spanish, Japanese, and Chinese (Simplified).
Track your reading progress with Time To Read
Kindle Fire HD 8.9” calculates your reading speed to let you know when you’ll finish a chapter or book.
Support for Kindle Editions with Audio/Video
You can now read books that contain audio and/or video clips.
Print Replica Textbook Enhancements
Scroll through thumbnails at the bottom of the screen to preview pages and jump quickly between chapters, and mark important notes and highlights in your Notebook for easy reference.