Ubermix is a x68 based ubuntu distribution. If there is a large base of users requesting it, maybe Jim will port it.
But using a system like ubermix is not against the raspberry pi "philosophy" ? It's a computer to build, test, reconfigure, and to analiyze multiple hardware - software configurations.
Also, RP 1 is very hardware limited. Ubermix 2 or 1.5 will be too slow. I read some reports on RP2 being just good for normal use, but i don't know.