Welcome back! Google Play Services 3.1 is such a ridiculously huge update; I had to stretch it out over two articles - that's a first for APK Teardown. If you somehow missed the Google Play Games extravaganza, part one is right here.
Part two is all about the non-games discoveries, which there are a lot of. Before we get into that though, there is one detail I left out of the games article that I really should mention:
The Play Games Codename
Google always comes up with the coolest code names for projects, and the Play Services games client is no exception.