It depends. There are so many options, it could go many different ways.
If Werdum wins, and JDS and/or Arlovski wins, I think you have to go with one of them. If JDS and Arlovski both lose, I say Miocic. If he loses, I would say Rothwell deserves it over Overeem, who deserves it over Mir. But Overeem is the bigger name, and I could see him getting it over Rothwell just because. Also, if JDS and Arlovski are your top contenders, and Mir or Overeem beat them, does that raise their stock enough to jump Miocic and Rothwell?
If Cain wins, you have to think a Werdum rematch is a possibility. But it also probably excludes JDS. So if Arlovski wins, he probably gets it. Even if they want to do a rematch wtih Cain and Rothwell, I think they would probably rather give it to a bigger name like Overeem. So once again, I can see him jumping over Rothwell.
I mean, there are 4 different fights that are relevant to the title picture, it could literally be anyone depending on the combination of winners.