So I am watching the Google I/O keynote right now. Apparently Android (and somehow also iOS) get achievements and cloudsaves. Seems interesting.
I have a thread for that here. But let's keep this open to discuss the keynote in general. They also announced a subscription service for Play Music, Google Analytics integration into the Android developer console, app betas, and more.
It's likely that they'll also announce Android 4.3 and the unified messaging service.