Please refer to the wiki (http://wiki.gimp.org/index.php/Hacking:Porting_filters_to_GEGL) for an overview of the progress.
Google Summer of Code 2013 program:
- Carlos Zubieta added an OpenCL version for over a dozen of GEGL operations, so that more processing could be done on a GPU.
- Simon Lui ported the PSD plug-in to use GEGL. GIMP is now capable of loading 16bit and 32bit per color channel PSD files, and more PSD-specific features will be easily plugged in once a GIMP counterpart is available (such as layer effects).
- Marek Dvorožňák implemented a new N-Point deformation tool that makes it possible to deform objects while preserve shapes consistency. You can watch a video demonstration of the tool on YouTube.
- Ajay Ramanathan attempted to merge selection tools into a single tool selection with modes (rectangular, ellipse, single row/column, N-side polygon selection modes).
More details at: https://mail.gnome.org/archives/gimp-user-list/2013-December/msg00225.html
Gimp roadmap (future projects): http://wiki.gimp.org/index.php/Roadmap