Look at the promo (at 14-16 sec) from next episode.
http://www.youtube.com/watch?v=Z77P7ebT0QI&HD=1

http://s22.postimg.org/sba9etmzz/Red_jon2.jpg
Obviously McAllister is hunted by someone and is till alive.

There are 7 Suspects on the list. Its confirmed by Simon Baker and Bruno Heller that Red John is one the 7 on the list.
And its confirmed by Kira Tinsley that Red John have a Tattoo with 3 dots. 

Robert Kirkland = Confirmed Dead
Brett Partridge = Confirmed Dead (May have had a Tattoo, since the arm was burned) 
Bret Stiles = Have no Tattoo

Ray Haffner = Have no Tattoo

That Leaves us with 3 Suspects:

Reede Smith = Have Tattoo, but turned himself in, and it's confirmed Red John wanted Smith dead, Patrick also was very sure it's not him. We have also seen clues of this before, He is to chubby in comparison with Red John from before, different shoesize and so on.

This leave us now with 2 Suspect.

Gale Bertram = Have Tattoo

Thomas McAllister = Have Tattoo (Presumed Dead but looks alive in the Promo),

Now take a look at this link and see all the perfect comparison between Thomas McAllister and Red John.
http://thementalist.wikia.com/wiki/Thomas_McAllister

Besides: https://twitter.com/chrisnielsen/status/388894514057723905

"Got to double Xander Berkeley on "The Mentalist" Shortest my hair has ever been and I love it! Thanks Kevin Derr, Alex Daniels, Dane Farwell"

The stunt through the window in next episode? Xander Berkeley is the Actor of: Thomas McAllister

Than look at the similarities between Red Jon and Gale Bertam:
http://thementalist.wikia.com/wiki/Gale_Bertram

Its alot less similarities between Red and Gale Bertram than it is with Thomas McAllister and Red John.



Dont let your judgement cloud you with doubt. Look at the Hard Fact i gave you what is confirmed and whatnot. This leave us with 3 suspects, where Thomas McAllister fits the description of Red John best.