We'll probably see Del Rio defend the World Title against the Big Show, with some kind of stipulation added to it. Then we'll see a #1 Contender's Elimination Chamber match to determine who will face the World Champion at Wrestlemania 29. The participants could be Orton, Sheamus, Ryback, Mysterio, Sin Cara, and a returning Christian.
This is what I think, too.
ADR/Big Show is too personal now to be a Chamber match. They need that blow off.
I think they'll do 2 Chamber matches.
One war games style: Ryback/Sheamus/Cena v The Shield
One for the WHC #1 contender
I REALLY want Christian to be in the EC. I think he could contribute great deal in a match like that and put together some great spots. In has never been in an EC before and he usually has has creative spots. This will probably be the 4th year in a row thy won't put Christian in the EC even though it makes sense.
2010 - He left ECW and could've been in the SD chamber
2011 - Could've returned and been Ziggler's replacement. Returned on the very PPV to save Edge
2012 - Could've returned and been Henry's replacement. Returned on the very PPV with Henry/ADR
2013 - Could return and be in the WHC chamber. But they never bring him back in perfect spots to bring him back, so he'll probably comeback after EC