Google Photos for iOS receives an update allowing you to label faces, share animation, and more
Other changes allow the app to open faster, and the new version comes with bug fixes and performance improvements. One thing missing is support for Chromecast, which Google promises is coming soon.
The Google Photos for iOS app is available from iTunes and is a free app for both the iPhone and iPad. If you are using the app with either device, you need to have iOS 8.1 or later installed, or else the app will not be compatible with your Apple product.
source: GooglePhotos (iOS|Android), +GooglePhotos via Engadget