GIMP 2.9.4 Is Their First Development Release Of 2016 With Many Improvements
GIMP 2.9.4 succeeds the GIMP 2.9.2 release from last November. The GIMP 2.9.4 release features significant work on color management of images and related to that various color profile additions, improved file magic matching, various core improvements, GUI enhancements, new themes, various tooling improvements, updated screenshot handling for Wayland/X.Org, various plug-in additions, and much more.
I haven't seen the GIMP project put out a post yet about 2.9.4 on their blog, but you can fetch v2.9.4 already from Git and via the NEWS file in Git will give you a complete in-depth overview of the many changes to find with GIMP 2.9.4.
Per the road-map, while high bit depths, OpenCL support, canvas rotation/flipping, MyPaint Brush tool, symmetry painting, and other features are done, not everything is completed for the GIMP 2.10 requirements. Still to be completed before jumping to GIMP 2.10 is finishing up color management, a seamless clone tool, better support for image metadata, support layer masks on layer groups, and cleaning up libgimp. GIMP 2.10 won't have the full port to GTK3, which will be coming later with GIMP 3.0.