I seriously don't see Sheamus or Cena winning it. Whoever does will most likely cash in their title match for the World Heavyweight Championship since the WWE Title will still be the major prize in the power struggle between HHH and whoever HHH's power struggle ends up being against.
Sheamus has already won one Rumble and I don't see them giving him a second one considering the people who have been given two Rumble wins (or more...okay, only one person has more than two, but still...): Hogan, HBK, Stone Cold, and John Cena. Sheamus is not big enough to be in that group, especially considering the guys running around with one or fewer Rumble wins. As for Cena, it would be his third Rumble win (only Stone Cold has three and I don't really see them giving anybody else a third Rumble victory) and he would only be the third guy to win two in a row if he returned and won the 2014 Rumble (both HBK and Stone Cold won back-to-back Rumbles). Either way, I don't see either of these guys being a strong possibility to win the 2014 Rumble.
I have to second those who suggest Punk will win the 2014 Rumble. I can see Punk playing "second fiddle" to Bryan in fighting the HHH regime and chasing a "corporate champion" Damien Sandow for the WHC (which would both help Sandow by feuding with Punk and bring greater prestige to the WHC) while Bryan is taking on the "corporate WWE Champion" or "corporate WWE Championship No. 1 Contender" at that point (or maybe even HHH himself) in the Mania main event. The other strong possibilities I see winning the Rumble are Dolph Ziggler or Cody Rhodes.
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Sheamus has already won one Rumble and I don't see them giving him a second one considering the people who have been given two Rumble wins (or more...okay, only one person has more than two, but still...): Hogan, HBK, Stone Cold, and John Cena. Sheamus is not big enough to be in that group, especially considering the guys running around with one or fewer Rumble wins. As for Cena, it would be his third Rumble win (only Stone Cold has three and I don't really see them giving anybody else a third Rumble victory) and he would only be the third guy to win two in a row if he returned and won the 2014 Rumble (both HBK and Stone Cold won back-to-back Rumbles). Either way, I don't see either of these guys being a strong possibility to win the 2014 Rumble.
I have to second those who suggest Punk will win the 2014 Rumble. I can see Punk playing "second fiddle" to Bryan in fighting the HHH regime and chasing a "corporate champion" Damien Sandow for the WHC (which would both help Sandow by feuding with Punk and bring greater prestige to the WHC) while Bryan is taking on the "corporate WWE Champion" or "corporate WWE Championship No. 1 Contender" at that point (or maybe even HHH himself) in the Mania main event. The other strong possibilities I see winning the Rumble are Dolph Ziggler or Cody Rhodes.
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