There are some great ideas behind Sky, but right now the sample app does not even open anymore on my Nexus 5 and when it did, it just showed trivial content. Displaying one spinning square is not impressive, you need to display 1000 if you want to make an argument for Sky.

I don't think that allowing the app to update its code on the fly is a good idea though. You lose the PlayStore automatic app analysis and those 5 seconds delays before launching any screen are not acceptable.

Maybe that Sky is the future of Android, but it seems it is still very very far away.