I'm rooting for Daniel Bryan to win the briefcase for the WWE Title. I like the story of Bryan overcoming the man who overcomes everything (that's Cena, for those wondering) to win the WWE Title and finally prove he is one of the big dogs.
As for who wins the briefcase for the World Heavyweight Championship, I can't see it being anyone except either Randy Orton or Dolph Ziggler again. Ziggler winning it again would be shit booking since BOTH MITB winners will have been people who've won the case once already, not to mention Ziggler should already have a guaranteed rematch against Del Rio since champions always have a rematch clause after they lose their title(s). Orton recently talked about getting back into the world title picture and it would be kinda cool to see Bryan and Orton as the co-MITB winners, given their recent rivalry.