They released a trailer for FFXIII, an english one. There's also some new info. Each character has their own summon. Snow has Shiva, Lightning has Odin (I think), and the cutesy red haired girl has Carbuncle (I think). There's also a new possibly playable character in that trailer too, a silver haired chap.
Apparently during battles you can only control one character but I'm guessing you'll be able to switch which character you control at will.
Let's hope we get soem info about Versus too.