Google enables Play Store delta updates, helps you conserve precious data
 

At Google's developer conference, the company announced that it would soon offer the ability to download delta updates in its Play Store, and we're starting to see the promise fulfilled before our very eyes. These delta upgrades, which save time and bandwidth when updating larger apps by only downloading the actual changes (rather than the entire program), were spotted earlier by Android Police and verified by our staff. While it may seem like a minor feature, you'll likely be happy that you don't have to think twice about updating your graphically-intense games when you're not within range of a hotspot. Head below for a video showing the delta updates in action.

http://www.engadget.com/2012/08/16/g...delta-updates/