Google Play services is our new platform that offers you better integration with Google products, and which provides greater agility for quickly rolling out new capabilities for you to use within your apps. Today we’re launching Google Play services v2.0, which includes two new APIs, including perhaps our most frequently requested upgrade: Maps.
Details: Android Developers Blog - New Google Maps Android API now part of Google Play services
To know how to use the NEW Google Maps on your Android apps, refer to the Google Play Service document of Google Maps Android API.