[ Source. ]
All features from the first version, plus:
+ Slightly modified code
+ Added HDR+ parameters
+ Uses API24 (Android 7.0)
Versions like this will crash on some phones. Usually this happens because a certain feature is not supported by your phone. For example, the OP3/3T doesn't support (yet?) HDR+ for the front camera and the app will crash. If your phone support all features, then there's a chance you will have a stable and very complete Google Camera.