GIMP 1.4, which will be developed in the 1.3.x branch, will have the GUI
separated from the core, will be ported to Gtk+ 2.0 and will have several
other relatively minor enhancements.
GIMP 2.0 will have CMYK support, 16-bits per color value support, and many
other features. It will use the newly developed
GEGL
library as the basis
for its core.