Last year for the release of Super Smash Bros. Brawl, GameStop held a nation-wide Brawl tournament, with the first round being on the day of release at over 2000 store locations.
This year, GameStop/EB Games is doing the same thing with Street Fighter IV.
Select stores in select districts will be holding round one tournaments inside their stores across the country, with events being as early as February 21st.
While rules and regulations are not finalized, it is highly unlikely that players can use their own controllers/sticks, nor is it likely that any unlockable characters (Rose, Dan, Gouken, Akuma, Sakura, Gen, Fei Long) will be playable at round one events. Also note that it is unknown which system the games will be played on.
Call around your district to find out which store in your area might be holding a round one tournament, as well as the rules/regulations that store may be implementing.
If this is going to follow a schedule similar to the Brawl tournament, you can expect round two tournaments to be in one store per participating district roughly 3 weeks after round one tournaments - with more concrete rules nationwide.
The finals will likely be held in San Diego at the GameStop Tournament Store - with prizes galore.
Good luck, and happy calling!