It looks like Capcom is coming out with a big free update for Resident Evil 6 this December. Co-op will be added to Ada's campaign (but sounds like it still just Ada if you want to go solo) where the 2nd character is the HUNK like guy, and the campaign will also be unlocked from the start. Other addition are the new No Hope Left Difficulty, which I guess it going to be really no hope left of getting through that difficulty lol, and the camera is going to be pull back a bit. Sounds like a pretty nice update and it free.
Picture of Ada's co-op:
And here a comparsion of the new camera: