Cena wins.
Seriously though -- this is how the the rest of the year goes: Rock beats Punk at Royal Rumble to set up Rock-Cena 2 at WM29 which Cena gets his win back and wins the title.
If you think anything other than Cena holding up the title is happening to end WM29, youre a fukkin idiot.
I hate that it has to be true, but in the words of Jeff Harvey's old theme song...I CAN SEE THE WRITING ON THE WALL.