The always fun to read Gaming-Age forums has word of a rumored Street
Fighter 4 under development.

The topic came up during the Ultimate Street Fighter panel discussion at the San Diego Comic Convention. At some point someone asked a Udon Comics representative about the possibility of a SF4 game and the guy said something was in the works. Then a Capcom rep said they had not forgotten their fans and were working on something.

So, to summarize: Someone told somebody about something that may have had to do with Street Fighter 4.

Rumor:
Street Fighter 4 [GAF]