None of that is confirmed. You notice how Dante has the same outfit from DMC3 in the DMC4 snowy trailer? That trailer was a teaser trailer, so they didn't actually decide on everything 100%. There is also no confirmation of the location being in a snowy area, although it is a possibility, but remember, it was a teaser trailer. There was, once again, no confirmation of Vergil being playable, although many fans like the idea, and it is highly likely, seeing as how his poularity was great, but it is still not confirmed. At TGS they will have a playable demo of DMC4, so we will get our answers then. Although you say you know everything, you do not. Also, about Devil May Cry 3, Vergil
DOES fight beowoulf, Jester is just a bonus boss for each character. Vergil's play is only a copy of Dante's game, except without cutscenes (except beggining one) and Vergil is the character
Sorry. And BTW Kakashi, I think hes on the left side of the trailer. I haven't actually seen the trailer in a while, so I'm not 100% sure, but hes there, I assure you