IGN just revealed the next World Warrior to join Street Fighter IV. His name is Abel and is described as a man without a past. His story revolves around him searching for remaining members of Bison's Shadoloo and dealing with amnesia. There are a few more screens of Abel in action over at IGN.
At first glance, I thought this was a white Balrog. Seriously. Maybe it's because I'm just waking up and my eyes are a little fuzzy, but I really thought this was a white version of Balrog. Also, that is one goofy facial expression on Guile.