I'm actually pretty sure no one has actually been able to pay for the index yet, which means whenever you clicked Order that is your place in the reservation system. I clicked Order within seconds and I'm stuck on the Shipping Info page.
I was also F5'ing constantly before the hour, was looking for the Kit, and had the funds ready in my Steam Wallet, but I never had to enter any shipping address info or whatever. Instead the 'Buy' button on the store went to 'Ordered' immediately and I received an order confirmation via e-mail, describing a back order situation and stating a 2-4 weeks shipping period. I won't have to pay until later. I'm from the Netherlands.