The only way Punk comes back to WWE is if he wins a strap in UFC. If that should happen, and it is a BIG IF, Trips and Vince will fall all over themselves to sign the new "baddest man on the planet". Punk will be GUARANTEED his "WM Moment". But, until he makes major noise in UFC, Punk does NOT come back.
As for DBry: Until Roman Reigns is FIRMLY entrenched as the "face" of the WWE, DBry they will not allow back. If DBry comes back at the Rumble, EVERYTHING involving Reigns turns to shit and fast. Dbry's return at the Rumble will be akin to Christ appearing at the Vatican, and Reigns will get the crickets.