Yoshinori Ono stated at EVO 2010 that he'll be announcing something in two weeks that should get people very excited. He said this new project will be coming in about a year.
Since Ono made this announcement at EVO, it's extremely likely that it's fighting game related and he said previously that Super Street Fighter 4 is nothing compared to what's coming.
He apparently also said that it's not Capcom vs. SNK 3 or a DarkStalkers sequel, though.
During his speech at EVO, Ono went on to add that Street Fighter 4 won't stop since the arcade version is coming he paused there, but said he couldn't say any more.
In about two weeks, Comic-Con is taking place, and Ono mentioned he might have a trailer of the game to show at that convention.