I think the Rock is a good punt for the Rumble. Loses the match against Punk then enters the Rumble and wins it. Especially if he eliminates Cena at the end.
Ziggler is also a good bet for the Rumble at those odds.
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WWE unendingly projects just one scenery.
Think Cena is pretty much nailed on for the Rumble as a way to face the Rock at Wrestlemania.
ALMOST certain the Rock will beat Punk - the only doubt in my mind is will the Rock really defend before Wrestlemania??? On the other hand if he lost he'd have to win it before Mania... so...?