TheGreatLegend
The Cerebral Assasin
I think he'll come back for at least one more match.
...and I think that Brock will face Punk either at a WrestleMania or a Summerslam event. Punk's gimmick is based a lot around tearing down the 4th wall, and Brock would totally give him so much ammunition.
Punk has said that he hates part-timers like how Rock just walks into the main event of 28, and who is more famous for cutting and running as quickly as they could than Brock? Just you wait, if Punk gets his chance to tear into Brock, he'll throw some of his best material at him. There couldn't be a 4th wall in this feud. Punk will bring up the NFL, Cain Valasquez and Overeem, and how he should have just fought the Undertaker at 27.
I think if the WWE brings him back for one last hoo-rah, then it has to be against Punk. Punk would just make that feud awesome, and the match would probably be pretty great, too. CM Punk needs an opponent like this, he needs a feud like this, and a short little Summerslam feud between two Paul Heyman guys is worth the payday to Brock. If he's smart, he'll start calling WWE now to see when it can happen.
Firstly Brock Lesnar vs Undertaker is more of a possibility (if Undertaker returns as "The American Badass") than Punk vs Lesnar...
because of this :
[YOUTUBE]JvkPYJmP2ao[/YOUTUBE]
CM Punk isn't even in Brock Lesnar's league and Punk vs Lesnar would just be plain terrible. ITs funny now all of a sudden people are coming out and saying Punk vs This, Punk vs That. Damn Punk has become so overrated now.