The man
breaking in from the window (who indeed seems to be McAllister) has a gunshot
wound. He is probably the one who got shot in Jane’s house at the end of
episode 6. That is why his DNA was found at the scene. My guess is that McAllister
had the bomb with him and would use it in case things got ugly. Under Jane’s
gunpoint he tried to escape. He got shot but still escaped before triggering
the bomb.  That doesn’t make him RJ for
sure. Any man “innocent” or guilty who is hunted will do anything to escape. He
is at large trying to escape just like Bertram.  He can either be another red herring (the best
on for RJ’s final chapter) or be RJ for real!!!

I also
think that the scene with Partridge at the morgue and the mark (probably a
slummy tattoo removal) on his shoulder is odd. Can he still be alive?

My bet is
on a resurrection. McAllister’s or maybe Partridge’s.

Thanks for
reading.

Here is an article that gives some incredible clues to what goes down in next episode, although it definitely doesn't spoil anything.

http://www.spoilertv.com/2013/11/the-mentalist-episode-608-red-john_171.html

Because of the survey including all of the suspects, and because of the appreciation quote, I'm back to Partridge. Sorry I ever doubted you

why everyone thinks McAllister is red john?! showing up in the promo does not mean he is red john. I think that the real red john will appear when Patrick kills McAllister in the church, and this is where the real red john say "the game is over and I won."

OMG, this website was down the whole day!!!! I was desperate to read other's opinions and I couldn't! :P

It looks like it's the sheriff, but it's very suspicious that they let us see him in the promo...