Here is the name of those 3 apps :
Hangouts : Google’s Hangouts app has been updated from version 2.5 to version 3.0, and there are a few key design changes in tow. The most obvious is found on users’ contact cards, as seen below:
Google Drive : , Google Drive has been updated from version 2.1 to 2.2. The biggest change here is that users can now move files and rearrange things using simple drag and drop gestures rather than menu commands.
Google Play Store : They have made some layout change in Google Play Store app know more here.