I don't think there's any chance Punk wins Sunday, although Rock does lay him out on Smackdown (the last person to stand tall before a PPV usually loses in WWE). And they are setting it up with him as the underdog going in, with Shield in storyline not being able to interfere.
I think it would be great if Punk lasted through to mania as champion, but I just don't see them doing it. But man would I love a smarmy "I told you so" punk promo on Monday.
The name nobody is mentioning right now is Brock Lesnar. I believe he still has dates on his contract. So he's coming back at some point. Maybe the money match for mania is Brock and Rock. Which would be good because neither one of them would be going over a regular. I guess theoretically you could have Rock beat Punk, and Brock win the Rumble as a surprise entrant. You'd have to find a way to get the belt off whoever wins at mania, though, since they're both temporary.
Cena was just unbelievably awful on Monday. Watch him win the Rumble.