Amazon is shortly going to push an over-the-air update to upgrade all Kindle Fire users from version 6.2.2 to version 6.3. The upgrades will include a number of performance improvements such as faster reconnection to wifi after the Fire has been asleep.
It will also be adding the ability to highlight and share passages from books that regular Kindle users already have, and an application called “Book Extras”, which will serve as a portal to Shelfari content about a book while reading it. It is also going to add the ability to buy print-replica textbooks, which precisely duplicate the textbook page format on the Fire’s screen. (Hopefully they’ll be able to zoom in, given that the Fire’s screen is a lot smaller than the average textbook.) And it will add the ability to sync personal documents via Whispersync.
It will also change the rental period for Amazon movies from beginning when they’re downloaded to beginning when the movie is played for the first time, and add a Readability-style reading view to Silk.