...spoiler...
Jane has it all planed. In the promo you can see clearly that the gun is full of tape. Hidden by him under the bench church, probably at the end of the red dragon episode. In the promo, in the church is Bertram, with the ring on his hand and all the baldness. Maybe he shots Bertram to allure Red John(that's why he said that Bertram is Red John, that's why he shots him, not kill maybe, that's why Red John says he had won).
From the voice I do not know if it's McAllister or someone else. I haven't heard this voice during this show. Hope that Red John is someone worthy to be him, if you know what I mean.