Google Play Services 6.1 is heading out the door, bringing new Google Fit platform tools and other developer goodies.
The update should hit your device in the next few days—Google releases these updates on a rolling schedule. Google Play Services isn't really something for end users as much as it is for developers; it provides frameworks and application programming interfaces (APIs) that developers use to make Android apps. The new version includes APIs for Google Drive, empowering developers to improve server response times with apps that connect to the storage service. There's also an update to the Google Fit developer preview, so those making apps for the upcoming service can test out their wares before launch.
E-commerce also gets attention, as the Android Developers site says the update has "richer insights into pre-purchase shopping behavior and into product performance."
Presumably this will give shopping apps better capabilities at tracking what you browse instead of solely relying on your purchase history for finding ways to sell you stuff.
The Google Fit update enables testing of any fitness apps in the works for the health platform, which will go live with the launch of Android L this fall.
Google Play Services is an important tool in the company's efforts to curb fragmentation, as it allows Google to update core features and push out developers tools without going through the laborious process of updating Android.
Play Services will update automatically in the next few days, or you can grab the APK. However, any improvements are unlikely to be felt on your end for a while as developers must implement the new features into their existing apps.