Something is bothering me. Before you all jump at me. I believe it's McAllister or Partridge that is Red John but the comment that Heller said the comment about NOT TRICKING THE AUDIENCE makes me feel that Bertram is still in the running. 
THAT and the fact that in the sneek peek Jane is still talking about meeting Bertram - that means that is was INFACT BERTRAM IN THE CHURCH.
It's just a niggling feeling that is all