Well I know of two TRUSTWORTHY sources that have watched the episode already and spoiled a little.

SPOILER ALERT

1. Someone from the past "long gone" comes back.

2. There are MULTIPLE CASUALTIES from the bomb. Goodbye Stiles and Haffner. We know Smith and Bertrum live so I assume it's the visualize duo since they're together when the bomb goes off.

3. Something in the last minute CHANGES THINGS FOR THE CBI moving forward.

4. Something from season 2 is explained.

Obviously I have believed that BP is red john from the beginning, and this is a spoiler.

Patrick strangles RJ in a park and watches him die. TV guide has already reported that. Now I ask. Do you think he could strangle Bertrum or Smith? F no. Now a skinny guy like BP?!?!?!?!?!

It seems very clear that people with three dots on their left shoulder are part of the secret group "tyger tyger". And this makes BERTRAM,SMITH AND MCALLISTER amongst the members of this group or, if you like, Red John's allies. This is why they are seen many a time together.I have a strong hunch that only Red John's followers wear this TATTOO. Red John himself does not have this tattoo and this makes STILES and HAFFNER amongst strong contenders.
From the philosophical aspects of William Blake's work, however, only Brett Stiles seems to be the person who could understand, scheme and design an evil group  based on FEARFUL SYMMETRY. Also, Bruno Heller himself said that Red John is not a loner frustrated killer, rather he is like a schemer who might design the scheme but might not do the dirt work himself. Does not a person as intelligent, smart, charming and persuasive as Stiles fit this description perfectly?

I want to see how many visitors this site has. If you read this, please DON'T nonchalantly scroll past. HIT GREEN OR RED; it doesn't matter which one, but I would like to gauge the "membership" of this site to satisfy my curiosity. 

Thanks.

By the way, I think Gale Bertram is RJ, but I'll honestly be fine with anyone besides Smith. "Anyone besides Smith" seems to be the popular opinion, and I'm in full agreement. 

All I ask is that the writers have created a PLAUSIBLE story. I can't have another show go down the toilet because things aren't explained or cannot be explained *cough LOST cough*. As long as RJ does his creepy little voice when he's revealed, I'll be happy.

DON'T FORGET TO CLICK RED OR GREEN! Thanks. Theorize on, for the big RJ reveal creeps towards us with each passing moment.