One aspect of fighting is plateuing and Chris Weidman is far from it and gets better and improves his technique every fight. Munoz is what he is so there will be no surprises.
Weidman will be able to stuff Munoz's takedowns and maybe even score a takedown of his own. His BJJ gets better every time he fights. He trains with Costa Phillapou and Matt Serra and has shorter, tight punches than Munoz. I think this will look a lot like the Munoz/Okami fight. Weidman did have cardio issues against Maia but he took that fight on extremely short notice and Munoz is no cardio machine himself and he usually gets tired deep in fights. Munoz does have lots of power in his GNP but he won't be able to utilize it because of Weidman's wrestling.
Weidman will outstrike Munoz with shorter, tighter punches while Munoz wings his wild haymakers. Weidman will then stuff Munoz and eventually shoot for a takedown of his own and Munoz who is not used to being on his back will get into a bad postition and Weidman will secure a sub (Most likely an arm triangle or Darce choke).