Kane will be wearing a mask when he returns ... just bring him back a little bit earlier, problem solved. Granted Kane's mask probably isn't as big as a seller as Rey or Sin's but still. Since it's been gone for like eight years, I'd imagine it'd be a big seller.
I kind of wish his big stunt at the Rumble was someone kicking him during his big jump in the ring, and getting a false elimination (since he'd never entered the ring). Then ten or fifteen minutes later, he enters the ring and eliminates the guy who did that. Probably wrong on that but I think it would be awesome.