Well, looks like the development is a bit slow, so I am not expecting support for Kaveri (R5 / R7 GFX) before 2019....
In the meanwhile Dragonfly BSD works like a fucking charm with my A8-7600!! Full effin accelator, glxgears show an average of 4400 fps !! (about 4030fps average under Ubuntu Mate, about 4700fps under OpenSUSE Tumbleweed). Not only the darn thing works fantastic, not at all playing with the rc.conf, just the users need to be on video group.
cheers to Dragonfly BSD dev's , unfortunatelly it won't be my main BSD system, there is no support for ntfs-3g (just read-only NTFS) as fuse (the Filesystem in Userspace not the ZX emulator) is missing from the packages and also I need encFS (fuse based) too, maybe next time.