For those in the UK:
Carphone Warehouse keep pushing their delivery date back, and their support team keep saying different things. Some say 10th November, some say 13th, and one even said 30th November.
I gave up and bought it from GiffGaff who dispatched it to me within 10 hours!!!!! I ordered at 9pm and it's with me today on Friday. They sell the phone as a PAYG phone, but just pick the cheapest £5 top up and cancel the contract online as soon as it arrives. All their phones are unlocked, and the Nexus itself is already unlocked by default.