The interface is all Amazon and Kindle. It’s black, dark blue, and a bunch of orange. The main screen is a carousel that looks like Cover Flow in iTunes which displays all the content you have on the device. This includes books, apps, movies, etc. Below the main carousel is a dock to pin your favorite items in one easy-to-access place. When you turn the device horizontally, the dock disappears below the fold.
Above the dock is the status bar (time, battery, etc) and this doubles as a notification tray. When apps have updates, or when new subscriptions are ready for you to view, they appear here. The top bar shows “YOUR NAME’s Kindle” and then the number of notifications you have in bright orange. It looks quite nice.
There you go. This is the result of Apple putting its own interests ahead of those of its users. It’s certainly not drastic (as it would be if Amazon had pulled the app from the store entirely), but in no way can it be argued that this is an improvement for users.