Both titles are stupid. *SMACK LAID DOWN*

I mean; OK, it started as VersusXIII, or whatever order they put it in, and then it got delayed, delayed, delayed again, then Sony got a whole new console ready - and instead of acknowledging that, 'Yeah, this game got delayed... but now it's out. Rejoice', they just went and said 'Nu-uh, we'magonna call it SOMETHING NEW AND EXCITING, reigniting the hype, y0!' Smurf 'em, it just looks amateurish.
That said, since there doesn't seem to be a whole lot of touching points between this game and what remains of the XIII continuum, and being on said new console, it DOES make a whole lot of sense to drop the XIII relation and associated associations to "antiquated" 'ardware. [Hee, I makes alliteration, I smRt!]
(And Versus XIII was a pretty silly title to begin with.)

Damned if they do, damned if they don't. I'll pat them on the back if I think the finished game is good.