I think the true identity of Red John is either Teresa Lisbon or Patrick Jane himself, failing this I think it's Bertram. Red John has always been one step ahead which is why I think it's got to be someone who's working in Lisbon's Team/office. We know the finale is going to take us all by surprise which means to me that it's not going to be one of the likely suspects which were on the couch. I still think that it is Patrick Jane and he has a split personality.