The release date for Super Street Fighter 4 will be April 27, 2010 in North America and will follow on the 28th in Japan and the 30th in Europe. Here's the official press release from Capcom announcing the release date.
The follow-up to the critically acclaimed Street Fighter IV will further redefine the 2-D fighting genre with a host of new features including new characters, new ultra combos, new online modes, the return of the famed bonus stages and retuned online and offline gameplay.
Super Street Fighter IV’s new characters include Street Fighter’s first Tae Kwon Do-styled fighter - the deadly female fighter Juri - classic Street Fighters such as Cody, Guy, T. Hawk, Dee Jay, Adon and more to complement the full roster of returning fighters from Street Fighter IV. Featuring all new user-selectable Ultra Combos and advancements to the online gameplay and matchmaking, Super Street Fighter IV is the ultimate vision of Street Fighter.
Watch Below SSF IV Promo trailer