GIMP 2.9.6 Readying New Clipboard, GUI Improvements
The GIMP 2.9.6 release has yet to happen but its NEWS entry was updated for the pending release.
What users can look forward to in GIMP 2.9.6 is a new clipboard implementation to copy/paste layers and layer groups, color tags, the mouse pointer dialogs and colors applied to images are now color-managed, various GUI additions, improvements to some of the built-in tools, a native WebP loader/exporter, and around 60 bug fixes over the earlier GIMP 2.9 development release.
Among the overall features for GIMP 2.10 are OpenCL support, high bit depth support, preview filters on canvas, MyPaint Brush tool, symmetry painting, XDG Base Directory specification support, and more. See more via the Roadmap Wiki page. Unfortunately it doesn't look like the GIMP 2.10 release is too close yet and this still isn't the release that will be porting from GTK2 to GTK3.