This was retweeted by Lagana just minutes ago, and I don't know if I can believe something like this would actually happen scripted. But, then again, this is the promotion that also had Katie Vick ('nough said).
Why do you think this would be a shoot? Conveniently, no security stopped Punk and he got another pipe bomb while WWE cameras were rolling. This is the perfect way for the angle to continue. To keep it "real" Punk cannot show up on Monday nights. Punk has to play his role in a more viral form. Regardless, it was a fun little bonus for those in attendance.
Maybe I'm jaded, but, how can ANYONE think it's a shoot? Vince wouldn't agree to letting someone leaving the company to win the belt, take it, and do any of this. Punk wouldn't have left with the belt without a new contract, or working agreement.