The Swift Evolution readme was updated this week with an outline of the release schedule, and priorities for version 4. Predictably the final release is scheduled for fall next year, presumably alongside iOS 11, Xcode 9, etc... However, during the year there's going to be two main phases of development. Changes that affect source and ABI compatibility first, then other changes as we get towards the release. Sounds good to me.
There has been talk (and even action) around using Swift on Android ever since it was first open sourced. This week, Brian Gesiak wrote on the continuing progress as well as talking about whether it's the right choice. Ultimately, I feel this is always going to be of limited practical use, but it's interesting to watch the progress.