A boost for a multi-plat game?
No, I don't think so.
We don't have any data for the previous Soul Caliburs, so I'd hesitate to whether I'd call it's opening on PS3 "poor" or not.
Edit - Soul Calibur did 71k in it's first week on the PS2 When it launched in March 2003 to a userbase of 12 million in the region of Japan, so 56k on a userbase 1/5th of the size when it launched on the PS2 seems fine to me.











