Check out the linked deck by @ciklum. Specially starting at slide number 11 to see the similarities between Groovy and Swift.
As I mentioned yesterday in my talk at GR8Day Warsaw, I think we should strive to push Groovy's presence on Android. If we achieve that it will mean a healthy groovy growth and survival in the future.
That the most hyped language in the past years has so many similarities with Groovy should encourage us to go further.