Eh, I think it's more for trailer purposes. Hell, that's how I got some of my best screenshots in SHIII :p'
I don't imagine it'll be any more... possible in campaign than it is in SHIII.
Oh, one thing I forgot to mention - the S class!
I think we now have definite evidence she's in and looking good!
By the way, did anyone catch the classes in the menu? It went Balao, Gato, Porpoise, S Class, Salmon... but there looked to be a scrollbar. What are they hiding? Maybe room for V-class? :p