A while ago, Debarshi started to work on a new GNOME application for photos.
For 3.8, we hope it will be complete enough to present as a preview, similar to how documents appeared in 3.4 and clocks in 3.6. Together with the Photos application, we will also gain a shell search provider for photos.
Debarshi and GNOME designers
A design can be found here: Design/Apps/Photos.
How to Help
Contact Debarshi or the designers