I heard from them in October. They did not have any plans for a Corona plugin at the time. They asked me if I would be able to write one, just as they had asked Glitch (see above). I told them I couldn’t write one (I’m not a Corona Enterprise user and don’t have experience with Obj-C). Since then I’ve come to realize that Google Play Game Services does not work on the Kindle Fire platform (it DOES work on late model Nook devices, but not the original Nook or Nook Color). As I understand it, GPGS is specifically blocked on Kindle Fire (unrooted), which I believe is so that Amazon can push their own social gaming platform (GameCircle). I’m looking forward to trying out Photon Cloud’s turn-based product, which is supposed to drop any day. Here’s the thread:
http://forums.coronalabs.com/topic/38372-is-turn-based-multiplayer-supported/
It doesn’t incorporate GameCenter or GPGS, and it’s not free, but it seems like it will be reasonably priced and I *believe* will work on all devices since it just communicates with Photon’s servers. See this thread for some discussion regarding Kindle/Nook with Photon Cloud (currently unresolved, unfortunately):
http://forums.coronalabs.com/topic/43023-does-photon-cloud-work-on-kindle-fire-and-nook/