Last night the official site for SSBB went up: http://www.smashbros.com/
A lot of people were expecting information about new characters, stages, or a new trailer with the opening of the site, but sadly none of those expectations were met. Not a lot was revealed, but Masahiro Sakurai did put up a list of the composers who would be working on the game: http://www.smashbros.com/en_us/music/music01.html
That in itself opens up a lot of room for speculation. If a composer (like Yoko Shimomura from Kingdom Hearts) is adding his music to the game, then there's a chance that characters from that game will be featured in Brawl. I'm not putting too much hope in that list, because these composers might just be working on their own rehashes of classic Nintendo music, but with so many new composers, it does mean there's at least a chance, and it's the only new news we have right now. There's also a sample of the new Menu music, which sounds pretty good.
Anyway, after the release of this game (sometime in 2007) hopefully we can get all the Wii friend codes up here for those who have it. I'm really looking forward to some GotWoot Brawl tournaments.
EDIT: Updates
Wii codes added so far:
XanBcoo - 2187 9383 9478 3722
(cmdr) Raven - 8864 1524 2978 0750
Nests - 1757 0132 8657 1690
Knives - 1946 0281 1987 1144
LaZie - 6482 6960 0909 6978
NarutoMaster - 5110 5119 4009 5539
Assertnfailure (NEW) - 6368 3519 3361 4786
Brawl Friend Codes:
Assertn - 3093 6765 4325
Knives122 - 0860 2913 6600
toonice714 - 4210 3702 5964
UChessmaster - 3007 7396 5417