I fail to see how The Rock defending the WWE Championship against CM Punk and 4 other competitors in a Chamber match is a bad thing. Both he or Punk could emerge victorious without ever pinning each other. That would set the stage for Rock vs. Cena vs. Punk at WrestleMania.
Yes, I am still convinced that WWE isn't stupid enough to directly have Rock vs. Cena II one year after what was promoted as "Once In A Lifetime". A Triple Threat makes the idea a spin-off instead of a sequel.
For me I would like to see a tornado tag EC pitting John Cena, Sheamus & Ryback vs. The Shield. It would start 1 on 1 with the other entrants entering at 5 minute intervals (preferably in The Shield's favour), pinfalls or submissions could occur during this stage to allow one team an advantage. Once all the entrants have been released from their pods, the first pinfall or submission would win the match. And for whoever asked the 3 non-title EC winners were Triple H & Undertaker (No Way Out 2008) and John Cena (Elimination Chamber 2011)