Google will effectively ‘shut down’ Google+ Photos from 1 August and replace it with the company’s new Google Photos service.

Users of the older service will still be able to share, comment and view +1 photos and videos as they always have.
They will also remain on the Google+ service for the foreseeable future and accessible via the Photos tab of the Profile page. However, backup, editing, creations, private album management and sharing to other apps will be handled by the new service.
For more information and links to the new service, visit https://plus.google.com/+googleplus/posts/d1XubVAZ5hV.