I too had a message from Amazon.co.uk that they didn't have the MP book and had to revise the delivery date to early December. I was actually going in to my account to cancel the order when it showed up as "Dispatching soon". They sent it off yesterday and it arrived this morning. So, three days later than expected BUT two weeks earlier than their panicky revised estimate. And I got a nice pre-order price of £11.
Still, like Morrus said, they always do this with the
4e books; it happened just the same with AV.