Isn't the big rumor that it's gonna be an MMA style kind of fight? There was another thread about it.
Paul Heyman stating on Raw that he and Brock will only name the stipulation after the contract is signed makes me think they'll go this route, with Heyman and Lesnar believing that Triple H will have no chance against Brock at his own type of fight. I like the idea, but it's a shame that it just has to be Triple H that ends up prevailing against Lesnar at this type of thing. Hopefully, they end up working it out so that Lesnar wins, but once the fight inside the cage is done, either Brock or Triple H say it's not over yet, and a big brawl erupts outside of the cage. This goes on for more than just a few minutes, and Triple H manages to lay Brock out with a sledgehammer and shit. He then stands over him doing his pose and gets to walk out standing tall. This way, Brock 'wins', but Triple H still gets his revenge.
Personally, I'd be fine with just another non-sanctioned match but I'm convinced they're going down the MMA path.