I think the adding of support for writing Java to create Android apps inside Visual Studio is actually a lot more likely than some of the things I've heard and I could probably make a good business case for it too.
It should go without saying but for the avoidance of doubt. Of course I don't really know anything about what may or may not be coming. This is just my speculation. If it turns out to be true you can be as surprised as me. ;)
I'm looking forward to announcements .... but not expecting to hear anything related to actually building apps for Windows 10 until build.
Update: my logic