Here's the blog of a fan who has translated in English the quotes from the second All Star Battle trailer and the moveset of the first four chracters (Jotaro, Joseph, Gyro and Wham).
Link to quotes: http://www.frametrap.net/2012/11/jojos-all-star-battle-tgs-quotes.html
Link to movesets: http://www.frametrap.net/2012/11/more-jojos-all-star-translation-stuff.html
Apparently Pucci and Buccellati have a lot of quotes. They might be the next to be announced.
I've played the PS JoJo Heritage for the Future game and I can tell that All Star Battle seems to have a nearly identical button pattern. Is this game going to be just as great as its predecessor?
I also wanted to remind you that this week a new issue of both Famitsu and Ultra Jump. This means new characters are bound to be announced. I'll post information as soon as I get them. Arrivederci (waiting for you, Bruno!)