I had to create a new amazon.com account for this with a US address, but paid for it with my Aussie CC. As long as the address is US the order will go through, no checks on the Aussie CC.
Got an email saying they will email me with the product key on release date.
Pretty sure that if you have to put in a (fake) US address then that classifies it as not being available here, and hence can't be posted…