According to Famistu; Ibuki, Mokoto and Dudley will be in Super Street Fighter IV bringing 9 new characters to the roster of 34 total playable characters. There is a rumored 10th character from the selection screen teaser, but the screen for that is not from an official source and Capcom has yet to comment on it. Super Street Fighter IV is set to release on April 27th in North America and April 30th in Europe. Official Trailer here. New characters include:
T-Hawk
Dee Jay
Juri
Adon
Cody
Guy
Dudley
Ibuki
Makoto