A general comment about the carriers...
We all knew the iPhone 5 was going to be announced yesterday. History shows that the prices would be largely similar to the launch prices of the iPhone 3G/3GS/4/4S...
We were near certain (weren't we?) that the new iPhone 5 was use nano-SIMs as opposed to micro-sims. Carriers have gone through this transition before with sim to micro-sim.
What irks me is that none of the five major carriers appear to have anything ready. They could have had web pages ready containing pricing, pre-order details, information on how to swap sims, and so on... They're not new to any of this, it happens with every single iPhone launch.
I guess we all want to give them our money in one form or another yet none of them seem to want to step forward and take the opportunity! I just don't understand why they let this happen time and time again. Instead they let their call centres and web-chat services become bombarded with the same old questions - making themselves look very incompetent in the process when they don't have any firm answers ready.
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You could keep trying this page over the next few days:
http://www.apple.com/uk/iphone/how-to-buy/
Still showing the 4S at the moment, but in the past it's been used to allow customers to reserve iPhones for pickup in store. I'm not sure if it's ever been in place prior to a launch, or only in the days afterwards. Worth a look though.