If it's going to be released on 360, then Versus XIII should do the same. It wouldn't make sense if they didn't, anyway.

There's a rumor that it will cause a delay because they will release XIII for PS3 and 360 in Europe and NA at the same time and that they haven't began working on the 360 version yet. Then again, there's another rumor that they won't release it at the same time. Gotta have to wait and see.