In addition to the new characters, Red Focus Attacks and other changes, Ultra Street Fighter IV will include another major new feature—the ability to choose what version of a particular character you want to play as.
This feature will allow you to choose from the original Street Fighter IV, Super SFIV, Super SFIV Arcade Edition, Super SFIV AE ver. 2012 and Ultra SFIV versions of characters, significantly expanding the amount of tactical options available to a player.
The feature is demonstrated in the video above. Ultra Street Fighter IV is slated for release in June for Xbox 360 and PlayStation 3, with a PC release scheduled for August.