Taken from IGN (http://ps3.ign.com/articles/102/1026154p1.html):
"With millions of copies sold worldwide, it was pretty much a given that Street Fighter IV would get a sequel. Now we’re starting to hear first buzz about a followup.
The Japanese Street Fighter IV official blog made its usual weekly update today. In the column from last week, writer Natsuki Shiozawa had made a vague promise to speak about a sequel in this week’s column. She lived up to the promise, but all she could do was issue another promise that a more solid announcement would be made in the near future.
While this is just an announcement about an announcement (making last week’s post an announcement about an announcement about an announcement), it does seem to at least confirm that a sequel is in the works.
The term sequel, it should be noted, doesn’t necessarily mean Street Fighter V. We imagine that Capcom would go through a few Turbos, Supers, and Dashes (that’s what Japan called their Championship Edition) before giving us a full numerical increment.
Naming aside, the big question is what characters we can look forward to for the sequel. In a past interview with Famitsu, SFIV producer Yoshinori Ono revealed that work was partially completed on SFIV versions of T.Hawk and Dee Jay. But two characters wouldn’t be enough for a followup! Perhaps some additional characters from SFIII and Alpha are on the way as well?"