Enjoy the trailer and the very informative Gamespot interview:
Gamespot also has a preview article that sum up most of what ono san says in the interview.
From the article: " While Capcom had initially considered making SSFIV's content a download pack of some kind, it became clear that just tacking the new content onto the old game wasn't going to be possible. As a result, SSFIV will be released as a standalone disc that won't be sold at full price. But, the producer explained, before you get rid of your SFIV disc, be advised that SSFIV will offer current SFIV owners a bonus that Capcom isn't revealing at this time. "
The article also features a bunch of new screenshots that you should check by clicking here.
Super Street Fighter IV is set to be released in a stand alone disc (priced less that $60) in early spring 2010.