It's being suggested this morning that Final Fantasy Versus XIII is no longer a thing, with the development being moved to PS4 and the game being renamed Final Fantasy XV.
"Square-Enix announced Final Fantasy Versus XIII years ago and the game was lost in the limbo," says a post from VGLeaks, which doesn't provide a source for this information. "Square decided to halt Versus PS3 development two years ago, but the RPG wasn't cancelled, why? Two years ago, Square-Enix moved the game to PS4 and Sony got in the project."
"Actually Sony is co-developing the game with Square-Enix, therefore, this game will be exclusive on PS4. Square renamed Versus to FF15 in the middle of this process. Sony's studios are helping SE with FF15 assets among other tasks."
Square did suggest that it would be announcing a new Final Fantasy game at E3 for the PlayStation 4, although details remain vague at this time. We'd suggest taking the above with a pinch of salt, just incase this turns out to be false information.