Please NO, nothing from Amazon. Certainly not FireOS. Amazon is a serial killer of competition. See acquisitions since 1998. Amazon should be forced to support DRM free ePub and Adobe DRM ePub on Kindles and Kindle Apps and FireOS. Amazon's aim is to make MS, Google and Apple look like Amateurs. They need broken up and existing laws enforced, not encouraged!
World's richest man (or close to it) wonders what to do with his money? Pay people properly!