I think a lot of that has to do with whatever they are setting up with Seth Rollins. One of them is flipping to heel eventually. Over the weekend Rollins made mention in the ring of Punk trying to destroy the WWE in the past and he got jumped in the ring today. So, he's still a face so far.
I could see either of them flipping, depending on crowd reactions to Punk. If the crowd accepts Punk, you go with him as the face, if not, you go with Rollins.
I expect we are in a holding pattern for now, until they figure out what to do with Punk. He can't cut a promo on AEW due to NDAs. He can't rage on WWE yet, as he just opted back in - would make no sense. No feuds set up yet. What's really to talk about?
You could have one of the faces from the winning team confront him for upstaging them. But they're all faces and that would come off as petty and small and that also forces your heel turn without much thought or long-term strategy. So, vanilla promo.