I have some issues : at first after upgrading to latest -current, KDE couldn't start anymore as liblzma.so.0 was missing.
A quick symlink to /lib64/liblzma.so.5.0.0 solved that.
But now there seems to be part of KDE System Settings missing, particularly in the Appearance of the desktop : no entry anymore to set the desktops fonts, the icon style, etc.
I guess a rebuild will be needed, though I suppose it can wait for the actuel -current inclusion.
On the sidenote, using libdrm, mesa and the open ATI driver, all from git using gallium, I find the whole desktop much snappier on both my laptop with R300 chip and my desktop with R600. Just still need to disable blur, but I really don't mind.