Excellent question.. lol
But unfortunately I don't have a response to your original question either. I've been looking around the web but haven't found anything. Its weird too, because there have been few app updates since 9/20 for Amazon, but none of them have a new UI. Same with Chase, Citibank and a few other apps. If you are spending the time to constantly update the app, why not spend a little more time and redesign it too.