There's more anecdotal evidence today that Google+ will at some point support games much like Facebook. SlashGear (with the help of a tip from a reader) uncovered a help page on Google+ that refers to a "Games stream." The help section list the following:
"If you're looking for updates shared from games, check out your Games stream," reads the help page in question.
This bit of information follows a gaming reference in Google+’s source code, including APIs like “/_/games/getGameFriends”, “/_/games/getActivities” and ” /_/games/postToStream”. Earlier this year Google was searching for a Product Manager to head up something called "Games at Google."