Event Hubs has been keeping the world exhaustively, massively updated on the huge number of changes that Capcom is making for the "Version 2012" patch to Super Street Fighter IV: Arcade Edition, and it looks like each fighter got some kind of tweak.
So far, the biggest changes all look like control and damage adjustments. Ryu's Metsu Shoryuken Ultra hits higher and is easier to pull off. Dan has become his strongest version of any Street Fighter game yet. And Sagat's practically a God Mode tier fighter, but they gave his Angry Scar Tiger Uppercut more damage anyway. And that's just the icing. Make sure to visit Event Hubs for the full list.
Surely, there's no more tweaking to done after this, right?
[Source: Event Hubs]