GIMP 3.0 has been more than one decade in the making as the port from GTK2 to GTK3, also transitioning away from Python 2 to Python 3 support, and a wealth of other improvements from the UI to lower down into enhancing this open-source Photoshop alternative.
The GIMP project announced on X/Twitter today that they have entered the string freeze for this much anticipated release.
Isn’t the latest version of gtk gtk4?
They’ve been working on porting it since back in 2012, and didn’t want to redo a bunch of the porting work before they even released it.