From RAW:
Viscera, Shelton Benjamin, Johnny Nitro, Jeff Hardy, Chris Masters, Kenny Dykstra, Ric Flair, Carlito, Shawn Michaels,
Edge, Randy Orton, Super Crazy, The Great Khali
From Smackdown:
Chris Benoit, MVP, Matt Hardy, The Miz, Chavo Guerrero, Finlay,
The Undertaker, Kane, King Booker, Gregory Helms
From ECW:
CM Punk, Sabu, Sandman, Rob Van Dam, Bob Holly, Tommy Dreamer, Kevin Thorn
Kennedy's wrestling Batista in a singles match, so he's not in. I doubt either Hardy or Nitro will be in for a long time, MNM are wrestling the Hardys in another match.
I think HBK will win (just looks like the way they are heading, HBK v Cena, somewhat), and besides Punk and Carlito, he would be the one I would want to win as well.