The Wii U is not the road to turn towards for Street Fighter fans. Ultra Street Fighter IV is dropping early next year, both boxed and as DLC. It will feature new stages, modes, and five new characters (including Poison, Hugo, Elena, and Rolento).
According to a tweet by Street Fighter's ever-delightful Yoshinori Ono, there are currently no plans to bring Street Fighter, Ultra or otherwise, to the Wii U. Let me pull my Street Fighter II SNES cart out in memoriam. Also because I feel like playing it.
Perhaps when Street Fighter V comes out in five years it will be on the Wii U.