I ordered a 32GB Black at Oct 31, 2013 12:06:37 PM PDT, and I went to cancel it now (I was a bit bummed at the reviews of the battery life) and it says
"We cannot cancel your order, as it is already being prepared for delivery. If you haven't already, you will receive an email with your order status soon. For further assistance, including returns and refunds, please visit the Google Play Help Center."
I thought this was interesting since it implies that it will ship today or tomorrow - which could be interesting for the rest of you who are curious when yours will ship.
As far as me cancelling it, I will get it, play with it, and see how well it integrates with the security policies of my company and how well the battery life in the real world compares to my iPhone 5 and then decide if I want to keep it, return it or sell it on Ebay.