So we heard a gunshot at the end, then in the promo we see McAllister's, Haffner's and Stiles' photos on the board. When Rigsby says "Red John brought in a bomb to kill Jane and the other suspects" he points at the board. Therefore, we can presume that the 3 people I mentioned are dead. This leaves us with 2 suspects, Bertram and Smith. Neither fit the descriptions given by Rosalind Harker and Sophie Miller. Something interesting I spotted was at the start when Smith was looking at the hanging body, he asked another cop/agent to check for his ID because he said he didn't like heights (or something like that). Smith is the only one who has Acrophobia, but its probably a red herring. If my ovseration about the 3 suspects on the board are correct then Heller has killed off the two favourites for Red John, well played Sir, you keep us guessing. I seriously have no idea who RJ is now. Will Partridge come back? I doubt but don't rule anything out.