BLUE BIRD a.k.a the dove that carries a dynamite stick in it's beak.

Red John is dead... Long Live the Blue Bird.
Why do we need a serial killer when we have the one thing that made him wet his pants?
Enter... Blue "pigeon" Bird.
That's right. The very thing that scared the sh*t out of the "officer of the law" will be back, to terrorize the FBI just because it can. Perhaps it would send the whole park of it's buddies to crash into the headquarters windows and paint the whole town in BLUE. 

Or...

Will the "mother of all scares" be released at the altar for a "cute" effect? 
To find out the answers to all of the above questions tune into Season 7. Coming soon...