Don't know how I'm going to make it through this week after watching the Fire and Brimstone promo, it looks so good!! My bet is either McAllister or Bertram despite their baldness, with Ray being the dark horse. The chemistry between the Sheriff and Jane was excellent when he saved his life, so I think he'd be a satisfying reveal. Also the thing that really struck me was his pointy, heeled shoes. It isn't categorical evidence, but I think they are the closest match to the pair Red John wore, way back in the season 2 finale. He's an excellent whistler, possible fear of birds which everyone keeps mentioning, middle aged (in fact Bruno has made the character younger than the actor, so he fits closer to the RJ profile) very light footed with quality hunting and shooting skills, and most importantly the actor Xander Berkeley is very talented and is apparently experienced at playing villains. Lastly, if you watch the promo again, McAllister is the only one sitting with his legs crossed similar to the way Jane does. Not sure if that means anything but...