Android Police reports on an information leak out of Google in the lead-up to their I/O conference, which starts on May 15th. A new version of Google Play Services contains information about "Google Play Games,"
the company's long anticipated unified gaming service. The leak shows support for saved game syncing, matchmaking, notifications, game invites, achievements, leaderboards, and integration with other Google services.
"Who can send you notifications is, of course, managed by Google+. Pressing that button will bring up the usual circle dialog. All Play Games identity work will be done by Google+. Try and look surprised. ... Play Games can somehow "auto pick" players, which means you can manually pick them too. Presumably this would go down in a match-making lobby of some kind. There are limited slots to a game, we just don't know how many. ... Leaderboards by time - choose this week, all time, or today. You can also show "player-centered" scores so you can find where you are on the boards. Leaderboards plug into G+ and can be non-public. You can also filter the leaderboard by people in your circles. It will also show you what percentile you're in.