As I said all we seen of Versus XIII was a concept, and that was not even much on it's own.
Also the game was announced far to early, many games you have played in your life have also went through these changes, it was not just shown to public or shown time after the games release.
I guess to put in better perspective, think on how FFVII was to use New York as a setting, as how it was to be on Nintendo 64, etc. That's pretty much what is going on here but the news of FFVII concept wasn't revealed to the public like FFVersusXIII.
EDIT: Even with Nomura being director, trust me things would still be changing.