Exactly what I predicted/expected to be honest.
Coupled with the way he left, it makes sense for him to return as a face I think. He didn't quite have that spark during his recent heel run. And I think that Heyman turning on Punk to have Lesnar go against him is a good feud in the making. I know that many will say that Punk is too small to feud with Lesnar and blah blah blah, but I think it's a good match in the making. Plus, some verbal jousting between Punk and Heyman is something we can certainly look forward to!
Side-note: I wonder where this will leave Curtis Axel? Will they include him in it? Or will Heyman be coming out with Lesnar and Axel simultaneously like he did when Punk and Lesnar were on tv the same time? If that's the case, they we can look forward to a lot of Paul Heyman on our screens