Let's see here..... Brock is back, for a year. Let's look at bang for the buck. I personally see them setting up for Austin vs Punk as the big match to build for a year, but the likelyhood of that is slim and none, so moving along.
I think that HBK superkicks Taker at the end, setting up for HBK vs HHH at Summerslam, since that is where the last big HBK return happened. Next year at Mania, triple threat between HBK, HHH and Taker, which can build after SS.
Now somehow we have to get the 2 biggest matches everyone wants to see done within the terms of the contract. First, Taker vs Brock doesn't need to happen at Mania, in fact, I wouldn't let it happen at Mania. Taker doesn't need to win to be huge, but Brock will have to get some take for the give he has to, well give. Personaly, I see them going this way. At the end of the HITC, Taker's won, HBK and HHH staredown and leave, the 'Here Comes the Pain'. Brock comes out and F5's Taker. Huge heel heat for Brock. However, we know that if Cena is left standing at the end of Mania, Miami will be pissed. So, Cena wins and 'Here Comes the Pain' again, and he lays out Cena stares down Rock and send s fans home happier.
Monday night, Cena claims he wants the big match with Brock and Taker claims the same. This sets up Brock coming out. Brock tells them that he doesn't care, but it won't happen until Mania. This sets up Cena vs Taker at the next PPV. Meanwhile, Brock can talk about laying out the Undertaker, which will lead to HHH claiming that he only did it because of the beating he laid on him. HHH vs Brock at the next PPV. Cena goes over Taker and thinks he's got it set with Brock. The next night after that The Rock comes out and says that he wants a shot at Brock, which then sets up SS re-match with Cena. Rock goes over, which leads to the third and tie-breaker match at RR. Cena goes over to face Brock. Punk who gets pissed that he's the champ and still being looked over, comes out and attacks Rock, which would lead to Rock vs Punk at Mania. Now, how do you get Taker and Brock together, well, you have Taker start screwing with him, and they end up at SS.
To recap we end up with:
The PPV after Mania:
Cena vs Taker: Cena goes over thinking he's going on the Mania, but ends up in a series with Rock
HHH vs Brock: Brock goes over with 'help' from HBK
SS:
Cena vs Rock: Rock goes over to even the series
HHH vs HBK: The return match once again
Brock vs Taker: rematch years in the making and one we want to see
RR:
Cena vs Rock part 3: Cena goes over, Punk attacks Rock to set up Mania
Mania:
HHH vs HBK vs Taker: Problem here is that this year is supposed to be an end of an era, but we know how that goes.
Cena vs Brock: massive match built around the idea that Cena wouldn't be who he is without Brock leaving: Cena wins
Punk vs Rock: battle of ego and mic work.: Punk wins
I have enjoyed the idea of having a year build, I really have, but to do it the same way 2 years in a row might be much. Establish that Brock will be there and spend a year trying to get to who it will be against. Now, granted, I doubt this all happens, but it is likely far more creative that what 'creative' will do.