Hi PC,
Is there an issue with your messaging system on the site?
I left two messages about updating my shipping address on existing pre-orders and didn't hear anything back.
Then I got an email early this morning querying the difference between the address on the order for MP-12 and my registered default address and asking which one to use (which I thought was nice of you to do).
I responded as soon as I saw the email, which was 30 minutes after it was sent to me then I got a shipping notification this afternoon using the old address.