Will CM Punk ever return to the ring?
Nothing's for sure. The Young Bucks talked to Rolling Stone and when Punk was brought up, Matt said that he has talked to CM Punk about making a return before, but it's all up to him, and he should make his own decisions about returning. He did say that he'll be the first to know about a return if it goes down:
I talk to him [CM Punk] a lot. I bugged him for like, I don't know, a year or two? I was really aggressive and at one point I realized that I should probably let him make his own decisions. He knows that there's an offer there and he knows that I'm the first phone call that he should make if he decides to get back into the business. He's told me that, he says when or if or ever he does decide to possibly get back into it, I'll be the first guy he calls. It'll be interesting. Whether or not he plays on our team or an opposing team, it'd be fun. When we're talking about guys, another guy would be Bryan Danielson [WWE's Daniel Bryan]. I don't see him necessarily joining Bullet Club, but he'd be a fun guy to wrestle or to work with or whatever. Just to have him in the ring with us would be incredible.
CM Punk hasn't associated himself with pro wrestling since he left WWE in 2014 on bad terms. He has since taken up MMA, and despite a quick defeat in his first fight, he is currently training for another.