My latest idea/theory, if he's not going to be involved with Heyman:
Regal recently wrote on Twitter (Kayfabe I'm positive) that he's dissapointed in Daniel Bryan, pointing out that his protegé was now hugging monsters. I could see a future storyline where Bryan resents that and calls out Regal. This could go many ways, but I could see it going Bryan/Regal in a feud. And when Bryan gets the best of him, Regal says he's got a new protege. Insert Ambrose/Bryan. More of an idea than a theory, since this Kane/Bryan thing is bound to go on for months, probably to WM and beyond. But it could be cool. They could also go with Kane/Bryan vs Regal/Ambrose, but I'm not too keen on that, and not sure how well it would mesh. But there's some possibilities.