Introducing Super Street Fighter IV shortcut panels for Nintendo 3DS. If you played the Street Fighter iPhone edition, I believe it's similar like its assist mode, which you can perform a move by combining the SP button and direction keypad, as well as performing Ultra Combo with just one tap on the appointed button.
The 3D adaptation of Super SFIV uses the touch screen for easy access to moves. You can program four panels on the touch screen to correspond to individual moves.
The game appears to be pretty flexible in what you can assign to the panels. Examples mentioned at the official site include Ultra Combos, throws, Focus Attacks and standard special moves like Chun-Li's Spinning Bird Kick. You'll also be able to assign a simultaneous press of all three punch or kick buttons, which should come in handy given the 3DS button layout.