I was doing other things while watching Raw last night, so I didn't quite catch all of it, but it looks like they're actually pulling the trigger on Punk vs. Ryback. I'm going to preface this by saying I've actually enjoyed the meteoric rise of Ryback, but I really think WWE's backed themselves into a corner here. Since the match is a Hell in a Cell with no DQ's, they're going to either have to end one of the best title reigns in recent memory, or they'll have to kill off one of the best things they have going with Ryback's undefeated streak. Any other PPV and this could have worked (just have Punk retain by DQ), but now they're left with a decision where I'm sure even Vince doesn't know what he wants to do yet.
And Monday's Raw was really good, in my opinion. However, did anyone notice what happened at the end with Punk? As McMahon was announcing the decision Punk had to make (Ryback or Cena), Punk elbowed some fan in the face. Apparently what happened is that there was no security with Punk, and some idiot decided to smack Punks head. He did it hiding behind some innocent dude, to, and he hit him multiple times from the back. Eventually, Punk got pissed and just elbowed him. Now, the guy who got hit's thinking about filing a lawsuit.
EDIT: Right after posting this, I had a bit of an idea that could actually keep both runs going, and still make perfect sense. During the Cell match, Brock Lesnar (also a Paul Heyman guy), could do a run-in and start going back and forth with Ryback. During the ensuing chaos, Punk could slink out of the Cell and head to the back, while Ryback and Lesnar are still brawling. The match could then end in a no contest, and set up Ryback vs. Brock Lesnar at Survivor Series, and still give John Cena a few more weeks to heal before he takes on Punk in a rematch.