I don't know who Red John is but I do know that it is not Brett Patridge, why? you may ask, well here's why.
It has been stated that by the end of episode 1 of the new season the list of Red John suspects will be down to 6 people, so 1 suspect will be eliminated during the season opener. When we look at the suspects that are going to appear in the episode we will find that there will be Bertram and Patridge. Since Bertram is still alive after this episode (he will appear in episode 2 and is currently filming episode 5; source Michael Gastons twitter) it is pretty obvious that Patridge will be elmininated somehow during the episode.
