Ok this is right out of left field and I doubt it would happen but stranger things have, one way or the other I think punk will loose his title in hell in a cell.
Now what if Cena can't make it, show seems to be in a story with Sheamus, orton isn't around so who does punk fight in the cell?
Well what if it is Ryback? Now hear me out yes he is young and he is just makeing his way in the business but what if he pulls off a victory against punk now it doesn't have to be clean, give punk something to bitch about. Ryback then goes to face the rock and beats him.
Somehow I guess you have to shoe horn a match rock vs punk or cena leaving the other to fight Ryback at mania.
Now I know it's all a bit vague but why else would you have ryback sticking his nose in punks business if it didn't lead to a match and ryback has to win otherwise all the buildup is wasted.