Okay, so the season finale was designed to throw us all off a bit, however, I think it actually helps make some possibilities more clear. The KEY if you think about it is that RJ seemingly read PJ's mind, and picked up on a happy memory that PJ had never told anyone. Now, unless the show takes some weird supernatural turn, we know that there has to be a reasonable explanation. So what could it be? My guess is that after PJ's wife was killed, he spent some time in a mental hospital before joining the CBI. We saw his therapist, and we saw that he was kept at least for a time in a small room while he was undergoing therapy. So, I suspect that while under treatment, he confided his memory, probably under hypnosis, to his therapist. If you remember the episode where she appeared, I think she indicated that she had broken up with the man she was seeing then, and PJ seemed to know him. I think that her boyfriend was Red John, and that he found her records of his sessions, and therefore knows things about PJ that he thinks he never told anyone. It's the only explanation, because PJ would never "forget" telling someone something like that, nor could anyone glean such specific information. It had to come during a time when he was under treatment, and probably under hypnosis. It's also telling that once again, last night's RJ accomplice was very matter-of-fact about her association with RJ, again appearing as if under some type of strong mind control. Excited to see how it plays out and keep an open mind -I don't think that RJ will turn out to be any of the seven that Patrick came up with, it's only natural that he would have excluded someone he might have met before beginning the chase of RJ at the CBI....

it is my thinking,r.j. is a slim effeminate, fair skinned,soft spoken man

I am wondering, How did he get those photographs of the "Suspected Seven"?

ALEX JANE.

He fits what we KNOW about him. It would make sense, he is pretty much the only one we KNOW who is nearly as talented as patrick. we saw him before season 3 finale. It seems to have a sense of 'fitting' in my mind, and has a planted seed which is just enough under the surface to surprise us...? i am no certain  but why not!? Patrick ran off from him to be with his wife and children  and plus, the carnival excuse would still fit! (or else, it may not be his father, but a step brother partick doesn't know about, trained by his possible deceased father to hate Jane  as he was never 'as good as Jane' We saw how forceful his father was, and how he persuaded Patrick to do things he hated. It is in a sense a quite poetic solution. this could possible just squeeze into the timeline. It is a big jump,, and i am merely wondering. I just hope it isn't one of the 7... it would be a little bit of a letdown!

I don't think there is a killer.  I think that the entire show is based on the fictional writings of an author who perhaps is yet to be determined.  The final episode will end with the author of the "Patrick Jane Series" saving the latest file and shutting down his or her computer / writing and retiring as an author with no final wrap up of loose ends or conclusion on who the "killer" really is.

here's what i wanted to post few weeks ago: "i've watched ep 13 season 4 again, and the idea that RJ could be PJ's brother crossed my mind, the last scene where Rosalind is with RJ, i just felt it was Jane, not him but the way he set , the way he's holding the cup of tea, the suit jacket with short sleeves, maybe his twin (circus life..)..but he's definitely a MAN!!! "
now i think the new lead to discovering RJ's identity is that he knew about Jane's memory, good memory that made him fell happy.. only someone who knew Jane since then would know about it, a family member, a circus friend, someone from his past, who could observe and tell when Jane is happy or not, .. noway RJ could have supernatural power like reading people'mind. one more thing that psychic Lisbon and Jane went to see does probably know sth about RJ; the fact that he knew lot of things about Lisbon is a little creepy :s 
now i can stick to the possibility of RJ being someone from Jane's past, again, maybe his twin..
tell me what you think about it :) 

As first introduced to us through RED JOHN
i tried every anagram etc. And  added the digits up to make 7.
In ep23 you find out there are 7 suspects.
I ask, is it too much to say that it isn't all of them working as a group.
I am still trying to find how each letter corresponds to each of them, but still the best theory i feel for a surprise element.
:)x