I'm going with Rock winning, too, and it's not bias. I think because Rock is scheduled to appear at multiple PPVs this year (which could mean only one other PPV, but still) I think he'll return the job to Cena with a possible Rubber-Match at WM29 (depending on how well received this match is). I also think Rock will get that WM moment that he never really got while still active. And I don't see what they do with Cena if he wins other than stick him back in the WWE title picture and put the title back on him. I mean, if he goes over cleanly against Rock and then loses the next month in a WWE championship match, any momentum gained from victory over The Rock evaporates.
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TheRock ~ Slow dramatic zoom-pan. Doesn't phase the hooded man.
"You have issues." - MWC. Pot. Kettle.