It's pretty obvious that The Shield attacked CM Punk, but I think we will learn that CM Punk is 100% not affiliated with him tonight. Up until now, The Shield has not attacked CM Punk but I believe we may see that tonight.
Everyone always talks about the heel turn of John Cena, but is there a better way to do it then having him be behind The Shield? They've never attacked him, and although they "cost" him the WWE Title, they powerbombed Ryback and Punk happened to take advantage. I hope that he is revealed as the mastermind and goes into a triple threat at Mania as a full fledged bad guy, with The Shield in step. Everyone loves the Rock and this would only fuel that. CM Punk would kinda be acquitted of his crimes, although he still acted like a dick so he would be a tweener on the road to redemption.
This scenario leaves the landscape very interesting after Mania, especially if the Rock leaves. If nothing interesting happens then we get a good guy Cena as champ, "hustle, loyalty, respect, boring", and Punk loses to the Undertaker and it isnt even interesting because he doesn't have the title (unless he wins, which is doubtful, come on). If Cena is behind The Shield, then you have either an NWO style faction with the WWE Champion as it's leader or tweener/face champ in CM Punk, which we all know we loved