Sigh. I've been periodically checking this thread for months for my 10 year old son. I was super excited to tell him that the Amazon update had finally come today, but when we just did the update, all of his data got erased, including local data. Yes we have a google drive account, and we logged in as soon as we fired up the game after the update. I made sure to set up a Drive account for him just for this. (He has a Kindle Fire HD, 3rd Generation)
No one else seems to be complaining about this, but my son is literally bawling on the sofa, having lost everything that he worked so hard to get. He had everything.
In other news, I have a Galaxy S6, and the update doesn't appear for me at all.