http://www.eventhubs.com/news/2010/feb/16/ibuki-confirmed-super-street-fighter-4/
Three new characters confirmed, making the total confirmed number of new characters in Super Street Fighter IV hitting nine, and there's still room for more surprise announcements. The link above shows some scans and shaky cam screenshots of the new guys, who are from Street Fighter 3.
The new characters confirmed thus far are:
T. Hawk
Dee Jay
Juri
Adon
Cody
Guy
Dudley
Ibuki
Makoto