The lure of layer groups drove me to build F12 RPMs for Gimp 2.7.0 last night. However, I was not to get that new sparkly pink pony for my stable, as layer groups are not in 2.7.0. That being said, there’s still some interesting tweaks (one I noticed was brush filtering, another was a very nice cleanup of the save dialogs) so you may want to give these a shot to check up on Gimp’s progress.
Use ‘em at your own risk of course. I am no expert packager and in my desperate fervor for acquiring pink sparkle ponies, I resorted to some dirty tricks to make these build :)