Today, Amazon released the latest Kindle Fire update. This is Version 6.2. Amazon also has a notice from customer service about the update.
Users are reporting that the update offers a smoother UI (user interface) and has changed the display of items on the home page carousel to only show the most recent items. The device previously showed all the books you had purchased from Amazon.
Users who have rooted the Kindle Fire are complaining that this update removes the root access, although the device can still be rooted again.