Eddie, via some form of cheating
Akebono. Why would WWE bring in somebody that the average fan doesn't know and have him lose to one of their stars?
Christy Hemme
Going out on a limb and saying Jericho
Undertaker
HBK
Cena
HHH (Batista will take it at Backlash)
Piper's Pit:
Hassan, Davairi, and Carlito (maybe) will come out and attack the two. Stunners to Hassan/Davairi, Sleeper to Carlito, and then Austin stunners Piper for the Hell of it.