It will probably just be Seth screwing with both guys all match until they knock him down and just beat the shit out of each other. This feud is going until at least Bad Blood anyway, so there's what like two more PLEs after Summerslam?
>Punk vs Drew w/ ref Seth
>Punk vs Drew vs Seth Berlin
>Punk vs Drew Saudimania
>Punk vs Drew Bad Blood
Drew wins this match or its thrown out but wins the triple threat. Punk wins Saudimania, they blow it off at Bad Blood.