In interview from LEVEL magazine the creators of Final Fantasy XIII and Final Fantasy Versus XIII have been interviewed.
They speak about story, the next generation of consoles, they touch on the characters. Nomura also speaks of how Final Fantasy Versus XIII is allowing him to create a world which he has been wanting to create but never had the chance to do so before. He is creating characters in a world which could easily be real. Of course the Fantasy is still there but he is keeping a close watch that the characters will remain believable.
He also mentions that this generation isnt all about graphics -- however PS3 has allowed them to do alot in terms of visuals which really enhance the experience. He wants the player to think as though they are not controlling a 3D model, but a creature.
"We're accomplishing things you hardly can manage without the PS3."
Pretty much smashed any multi platform rumors.
Click read more for the full interview