Amazon gives the Kindle’s interface a refresh - The Verge
The update mainly focuses on navigation, adding a bar to the bottom of the screen that lets you jump between the Home screen, the book you’re currently reading, and the Library screen.
Some have had the update for a few weeks, but Amazon has announced that the update will be rolling out widely over the next few weeks.
Amazon says more changes will be coming later this year, with an update that will let you see more recently read books on the Home screen and will refresh the Library’s collection view and filter and sort menus.