Obviously I'm getting the PS3 version... Unless there's something unexpected in that version, if which case I'll get it for - wait, I don't have a 360. PC then (if they ever decide to release it on the PC)?
Seriously, though, I'm probably getting it for the PS3. I don't think there's going to be a huge difference in the different versions except for the fact that the PS3 version is going to use Blu-ray (which means no or less switching discs).