I think that Brock will help Punk at HIAC setting up for a long build up for a Brock vs Ryback match at WM, where Brock will put over Ryback. After hearing the rumors of the Undertaker possibly winning the Rumble, I think the Taker will face Punk at WM for the belt. I think Punk will retain his title against the Rock, because Cena will screw the Rock setting up for a round 2 at WM. My predictions.
I was thinking about Brock as well. He has to come back at some point, still has plenty dates left on his contract. Maybe a Punk/Brock vs Cena/Ryback match at SS.