Not interested in that at all.
Rock vs Brock is just an exercise in uselessness. Neither guy is helped by it in anyway, nobody gets over, nobody gets anything from the win. I guess making it for the belt makes the belt look important, but there's no reason in hell Punk should lose the title just to feed the ego of 2 part timers who are leaving after Mania. Of course, that's WWE in 2012, no regard for their future, just plug old talent in the main event for a quick fix until people are completely burnt out on them. The only positive that comes out of it might be that Rock and Lesnar just flat out refuse to use the spinner belt and tell Vince they aren't going through with the match if he doesn't scrap it, which, in that case, I'll support the match, but under no other reason.
Cena vs Taker should've happened next year, but under the pretense that his match with Triple H in HIAC didn't. I have no desire to see Taker go 21-0. It should've happened but he ruined his milestone match, now retire.
As far as Punk vs Austin goes, I'm interested in seeing the feud, I really am. The problem is, Stone Cold is not an important win in 2012, let's just be honest about that. He's not. Regardless of the fact that he's the greatest wrestler of all time, his star power is nowhere near what it used to be. And especially on a card where it's 3'rd on the pecking order behind Rock vs Brock and Cena vs Taker, Punk vs Austin will be useless in elevating Punk. And if Austin goes over just like Rock did, don't even get me started on how damaging that would be.