OMG. In the promo Red John (we assume so) says "The game is over and I have won."...this doesn't sound like any of the list of 7, certainly not Bertram, but it does sound like a certain someone who died in Season 2 and had a thing for Lisbon...

Sam Bosco!

http://www.youtube.com/watch?v=XYOMRi2SxDA

I'm not saying it's definitely him, but it sounds very similar and if it was, what a shocking and amazing conclusion that would be. Heller did say someone from S2 would be returning...