I just installed the new unstable development release GIMP 2.7.4 on my new and shiny Ubuntu 11.10. I haven't done rigorous testing, just do what I usually do i.e a light touch and it feels faster.
The one window mode feels more and more native and not just a patch, earlier it usually back to multi windows when restarted. Feels great.
And no, the horrible S&M style splash screen still there.Just remember this is unstable release, bugs (and sleepless night) are expected.
Read here on how to add this PPA to your Ubuntu repository.
keyword : gimp 2.7.4 unstable ubuntu 11.10