http://www.joystiq.com/2009/12/22/ca...2-monster-hun/
They're spreading out their games over the year. No one really knows when any of these games were supposed to come out, but SSF4 was rumored for march.
Besides, April 6 is kind of early considering they haven't even announced all of the new characters/modes yet. Then it will be in the japanese arcades for a month or so to playtest, then it will be put on console, just like SF4.
They'll probably have the arcade version at Evo this year and that's in the summer.
If it shows up on console before the fall I'd be surprised.