From TVGuide

"Jane lives! In all seriousness, the blast does take out a significant
number of Red John suspects, and before Sunday’s episode is over, Jane
and Lisbon will go public with who they believe to be the serial killer.
But it can’t be that easy. "

There is no twist. We know who is Red John in the end of ep. 7.

Why it can't be easy?  Because Red John is the Director of the CBI names Gale Bertram??

I don't know...