GIMP 3.0 is finally out with GTK 3 user interface, better UI scaling on HiDPI, Wayland support, non-destructive layer effects, color space management, improved file format support, and usability improvements
https://testing.gimp.org/release-notes/gimp-3.0.html#updated-gtk3-user-interface
testing.gimp.orgGIMP - GIMP 3.0 Release Notes