I have watched the tv promo 6x07 again. They say: it's down to the final three suspects. But the truth, uncovering even a bigger lie.  I dont really think that one of the three suspects is red john, altough heller wants to see us bertram as the suspicious one.

Rigsby says in the promo red john planned the bomb to kill jane and the other suspects. I think that no one is killed with the blast. It's an set up by jane, to get the real red john. So the three suspects on the board(mccalister, stiles and haffner) are still alive other wise i think rigsby wouldnt say that red john tried to kill jane (he would say to kill the suspects). I think jane told rigsby to say that to the others that red john planned the bomb.

My guess is haffner, but we will see.