Review from 1up posted today, helps you understand the differences:
http://www.1up.com/do/reviewPage?cId=3177841
Odd. Future. Wolf. Gang. Kill. Em. All. OFWGKTA Don't give a fuck!
Fuck Steve Harvey. FREE EARL!
Final Fantasy Versus XIII will be the GREATEST game EVER made!!!
I'd take a bullet for Square-Enix!