Apart of probably a lot of people wanting to finally have Gimp 2.8 in stable, I remembered this (as I am using testing for gimp for a long time) due bug #464572 ;) Thanks :)
I tried 2.8.6 version but I have also used 2.8.4 for some time (if you feel it safer :/) Thanks
2.8.6 should be ok after talking with sping: media-gfx/gimp-2.8.6 media-libs/gegl-0.2.0-r2 media-libs/babl-0.1.10-r1 (gegl and babl come from bug 464572)
Stable for HPPA.
amd64 stable
x86 stable
alpha stable
ia64 stable
ppc64 stable
sparc stable
ppc stable. Last arch, closing