On the Google Fit side of things, this update brings a number of new APIs for gathering and managing activity data. Google says the new APIs will help reduce the memory requirements for Google Fit-enabled apps running in the background.

Additionally, the update brings some further integration between AdMob and Google Analytics, enabling automatic retrieval of Google Analytics information with any implementation of the Google Mobile Ads SDK…

http://android-developers.blogspot.in/2015/03/google-play-services-70-places-everyone.html