I have watched the promo. I think that we see two suspects, one is mccalister(who is flying:D through the window) and the other is bertram(he is on the run in the park or the graveyard). Honestly i dont think that neither of them is red john. They are not that stupid to show us something from red john himself.

Its actually weird that he sounds nothing like he sounded in s02x24. Then we thought it was partridge, but now he has a different voice. He sounds also like dr. linus wagner but iam really focussed on the list of 7 suspects.

My pick for red john is still ray haffner, other than him i would like to see as red john  mccalister, partridge and kirkland.

But please i say no to reede smith, gale bertram and bret stiles.