there will be more than two reveals at gamescon, as for geusses.
Gamescon- Ratchet, Snake, Sir Dan, Sackboy
PAX- Spike, Dart
TGS- Kat, Nariko, Wander, Cloud
NY comicon- Crash, Spyro, Ezio, Rayman
Dante from DMC and Raiden from metal gear solid will be in the game. check this link out http://www.ign.com/articles/2012/07/29/rumor-plays
They are not confirmed -_-, people please get your head out your **bleep**'s!