I kinda figured Cena is gonna win.
The only other person I could see winning is Roman, but I don't think he's quite ready for it yet. I mean, unless they want to go with Roman/HHH for the title at SummerSlam, I just don't see it happening. What I can see though, is Cena winning the title only to lose it to Brock Lesnar at SummerSlam.
It damn sure isn't gonna be Alberto Del Rio, that much I know for sure.
(Watch he ends up winning now. >_>)