The Rumble is wide open:
Cena - Cena will be involved in a title match at Mania almost for certain... so if he isn't a champion by then, then he is a contender.
Chances : 7 Out Of 10HBK - Could be an interesting way to set up HBK-Taker II or give HBK a shot at one last World Title run.
Chances : 6 out of 10Edge - If he's in the Rumble, he wins the Rumble.
Chances : 9 out of 10 Batista - Gotta be an option. Big Heel turns usually end up with a title run.
Chances : 9 out of 10Orton - Only way he can face Cena again (as i understand it) for the title is to win something like the rumble.
Chances : 7 out of 10Chris Jericho - My personal pick to win it after a year of amazing work. I think a Cena vs Jericho match would be really a great option. But Jericho vs Sheamus doesn't have the same look to it.
Chances : 9 out of 10HHH - After last years disaster Main Event against Orton he might fancy another crack at it. And what he wants, he gets!
Chances : 5 out of 10Morrison - If they decide to go with a younger guy then Morrsion has a put in a year (at least) of solid work and would be top of the pile i'd say. Usually the younger guys win MITB @ Mania rather than the Rumble to go to Mania. Plus the fact he has a IC title match @ the rumble means its even more unlikely.
Chances: 2 out of 10Sheamus - Can't be discarded given his rise although its more likely he'll enter as champion than challenger.
Chances : 2 out of 10Miz - His rise has been..... well Awesome but headlining wrestlemania hmmm.
Chances : 1 out of 10CM Punk - Currently going nowhere and in need of a direction. Maybe this is it.... but i doubt it!
Chances : 2 out of 10Bret Hart - Enters No.30 and shocks the world.
Chances: Sadly 1 out of 10Santino - Can you afford to underestimate the current Miss Wrestlemania. Enters No.30 and before he gets to the ring the last two eliminate each other, allowing him to simply step into the ring an win the Rumble.
Chances: -10000 0ut of 10