I'm thinking that the Rpi3 if it can run Android, that would be great. I would be a frequent visitor to the playstore mostly to download games that I already play, like "Brothers in arms 3" "GTA Vice city" "Max Payne" etc.
It would be an excellent way to try out different versions of Android from KItKat to whatever they decide to call Android N and beyond, although someone at Google or Cyanogen would need to compile a kernel specific to the Rpi3 I guess. If Google were really smart, they would jump on the enthusiast bandwagon and start supporting the Rpi3, and maybe even the Rpi2 b+ right away.
Funny thing is, I can see a future where there are as many OS choices for the Rpi3 as Linux is in general terms.