Google Play gets its update
It could be expected that a new version of Android (4.4) would also involve a major update to Google Play. It’s increasingly the way that Google minimises Android fragmentation by managing new functionality through the application-oriented Google Play Services.
Version 4.0 of Google Play services includes the Google Mobile Ads SDK and also changes to geofencing, Google+, and Google Wallet Instant Buy APIs, says Google. It will be backwards compatible to devices running Android 2.3 (Gingerbread) or later. This apparently accounts for more than 97% of active devices.
Note however, they are dropping support for the very old Android 2.2 (Froyo), “in order to make it possible to offer more powerful APIs in the future”, says Google
Maps and Location Based Services
“The Maps and Geofencing APIs that launched in Google Play services 3.1 have been updated to improve overall battery efficiency and responsiveness.”
Google+ and Google Wallet Instant Buy
“Apps that are enabled with Google+ Sign-In will be updated with a simplified sign-in consent dialog.”
New user control over advertising identifier
“To give users better controls and to provide you with a simple, standard system to continue to monetize your apps, this update contains a new, anonymous identifier for advertising purposes (to be used in place of Android ID).”