The major highlight of this release are layer groups, on-canvas text editing, advanced brush dynamics and the much desired optional single-window mode. You can check all the features in the release notes.
I have managed to build GIMP-2.8.0 on my desktop and since GIMP-2.8.0 will take some time before it reaches -Current, i will just put it on my SlackHacks repository. Basically most of them are the -Current's SlackBuild script which i updated a little bit, so if you have -Current repository on your local drive, you can basically use it. Just download the version needed to build GIMP-2.8.0 which i listed below.
Here is my build order and also list of dependency of GIMP-2.8.0 that i can track
GIMP-2.8.0 - babl-0.1.10 - gegl-0.2.0 - atk-2.4.0 - glib2-2.32.1 - libffi-3.0.11 (available on SBo) - gtk+ 2.24.10 - pango-1.30 - gdk-pixbuf 2.26.1
gdk-pixbuf package is still missing libgdk_pixbuf_xlib-2.0.so.0 which cause some other packages broken (eg: Acrobat Reader)Fixed (commit)