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That language will be web, I suspect. Perhaps Google will offer prerolled components specifically for Android? I strongly suspect that Chrome is the platform Google wants to push for client development now, with Android essentially as a shell for it. While web may arguably be "worse" on Android now, Google has a very large, talented engineering team who could change that relatively fast. Java is a dead end at this po…
Web is a platform, so they would need to rewrite half of Android, I don't think it would be worth it, I don't see real benefits of that for users or devs... I think that Java 8 is a great language, I like it a lot more than Javascript. Go would be great too.
As-is, native code on Android is a cluster, and even for games it's pretty uncomfortable and filled with Java shims. Kinda gross.