A quick tip for anyone who is thinking of downloading this expansion. I walked around for 1 hour trying to work out how to start the new quest. I was on the verge of giving up and contacting M/S to say my download hasn't worked.
It doesn't explain when you download it that you need to go to the chapel in Anvil and speak to the Prophet. I understand you can actually go to any chapel to start it, why they couldn't tell you this when you download it, I'll never know.