What exactly happened between the two of them, anyway? If it's a good enough storyline, I'm totally voting for SES to make a shift into the main event limelight. CM Punk is already a monster on the mic in promos (unless he starts singing again -- please don't ever do that again, Punk), and his heel behavior toward Rey Mysterio was blood pumping. This could be exactly the push he needs to make it up to a permanent seat on the main event roster.
What basically happened was at summerslam a ladder match between Jeff Hardy and CM Punk and CM Punk won. The Undertaker was gone for a while and then he returned to attack CM Punk in a pretty cool fashion at summer slam. So of course The Undertaker got a title shot at the breaking point ppv but the undertaker got screwed (in montreal) in a submission match with punk when punk had him in a submission hold be he didn't tap but the ref said he did so he got screwed out of the world title. Then it went to the hell in a cell pay per view where punk and the undertaker were in the hell in a cell match and punk got squashed and the undertaker won the world heavyweight championship and the fued was over.
Short fued that wasn't that good but CM Punk has the SES on his side witch would (if CM Punk is the one who did this to the undertaker) make the fued more interesting.