Well, there's nothing original about using the Klingons either - they're a prefab menace at this point. I've no doubt that these producers can make that exciting, though.
Doing a close-up on Khan's cryotube at the end of the movie constitutes anything but having the character "out of their systems." This movie really plays like a set-up for a bigger confrontation and given the somewhat soft box office opening for Into Darkness
I expect they'll want to pay off their investment is setting up Cumberbatch/Khan in this one right away.