Japan continues to get some major Street Fighter IV loving as evidence by the new Street Fighter IV Arcade testing. This latest build of the game has El Fuerte as a playable character and is said to have Vega and M.Bison as playable fighters as well. Can't confirm Vega and M. Bison returning for sure until Destructoid see some pictures or video, but they do have this video of El Fuerte battling it out with Zangief.
This latest testing of the game has also revealed a new fighter as evidence by the first video. His name is Rufus and he's fatter than E. Honda. Even though he's obese like crazy, he seems to move pretty fast still.