The update to Street Fighter IV that spilled out yesterday now has a name: it's going to be sold as Ultra Street Fighter IV, a pack that adds five new fighters to the game, along with a range of tweaks.
Four the five fighters have been announced. They're Rolento, Poison, Hugo and Elena. You can find the details of the tweaks to existing characters here.
Ultra Street Fighter IV is the name given to a complete retail bundle including the main game and this new DLC. It'll cost US$40. If you've already got Super Street Fighter IV, the new stuff will be available separately as DLC for US$15.