I'm working on Kotlin/Android stuff. Converting some parts of a project to try it out. I run an Android consulting company, so we can probably do something commercial pretty soon. Would like to know if there are any recent, general resources on the topic. The main thing I'm struggling with right now is the Java/Kotlin intersections from the Android SDK. Everything is possibly null, so there's lots of '!!' going on. Its good to force the developer to think about it, but some of this stuff will never be null, so it would be nice to "know" that.
If anybody is seriously into Android/Kotlin, we’re actually having an Android convention in September. We have somebody previewing Go for Android, and I think it might be good to have a panel of non-Java implementations. I know some teams working with Scala, and have had chats about other platforms. If I get things together, I may present, but its coming up pretty fast: http://nyc.droidcon.com/2014/