one thing we know for sure is the red john story line will be done concluded in episode 8 as its "red john" as episode 9 is called "My Blue Heaven" and 10 is "Green Thumb" and this is the first time bar the episode s406 (tho red john was supposed to of still been thought dead by everyone bar jane) that the title has not refrenced the color red or have a connection with something red i.e fire,cherry, rose, blood, crimson even pink

right back to the topic who i have wanted red john to be for a long time now is bret stiles (tho i dont think it is) as when jane and him first met they didn't get on but had a mutual respect for him, he is a very intelligent charecter and seems as now he would be smart enough to be red john, tho i went off him being red john when jane asked for the favour stiles had owed him and located lorali for him and  helped for escape for jane to talk with