Google Play Services 4.0 was released in late October just after the Nexus 5 and Kit Kat became official, bringing with it plenty of improvements to things like Google+ sign-in, Wallet, Location services, and more.
Today, via the Android Developers Blog, Google announced the rollout of Google Play Services 4.1, which offers developers more and better tools to make compelling apps.
First off, 4.1 will give developers the chance to take advantage of turn-based multiplayer mechanics handled totally by Play Services (for playing asynchronous games either with friends or strangers).

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Google Play Services 4.1 Begins Rollout With Location Reporting Battery Fix, Turn-Based Multiplayer, And More was written by the awesome team at Android Police.