The GNOME 3.9.4 development release was made available this week with many changes to its desktop stack ahead of the official GNOME 3.10 release in September. With this release, GNOME is in better shape when running with Wayland.
GNOME 3.9.4 brings with it now a Photos application that is similar to other desktop photo programs for managing local/online photos and offering other basic tasks for photo management.
The Clutter tool-kit for GNOME has improved state tracking and short circuiting, Wayland back-end improvements, and improved gesture recognizers. The Cogl OpenGL component also has EmScripten support, lots of Wayland back-end work and updated compositor support, a new fence API, improved blend state tracking, HSL color conversion APIs, and much more.
GTK+ 3.9.8 meanwhile has improved support for scaled output on high DPI screens but currently needs a Cairo branch for good support. This support is found in GTK's Wayland, OS X, and Windows back-ends.
More details on the GNOME 3.9.4 changes can be found via this mailing list announcement