We've uncovered a couple of hidden taunts for those of you who are complete SFEX Plus Alpha freaks. Simply enter the following button combinations during gameplay when you're playing as one of the following characters:
Skull Taunt: Left, down, right, up + Punch
Dhalsim Taunt: right, up, left + Kick
Highlight the Practice option in the Main menu and press the START button once. Next, press UP, UP, RIGHT, UP, RIGHT, UP, then press START. A message should appear. Go in the Practice Mode and you should see a Bonus option.
At the Player Select screen, press Up, R1, Down, L2, Right, L1, Left, R2. The code must be entered quickly for it to work. If it doesn't work, go to Guile and try again. When it works, choose Guile to play as Akuma.