It's turning out to be the worst-kept secret of this year's Google I/O -- 'Google Play Games' has cropped up once again in game changelogs ahead of its presumed launch during today's keynote. Eufloria HD has been updated with support for "Google Play Games achievements," and a note adding "We hope you enjoy using Google Play Games to save and share achievements!" A number of Gameloft titles have been updated too, with more subtle references "game services" support being included.
We're sure it'll all be official in just a couple of hours or so. Stay tuned to our Google I/O keynote liveblog for all the latest.
Source: Google Play