For those which can't see order now maybe it's because you are on a PC.
I placed my order from ma iPad without any problem. On ma PC i still have the old display : Ships:coming soon
I wonder if Apple blocked other browsers like Chrome and Firefox and only allowed Safari users (which would be apple customers) to order early or now?
I was using Chrome on my MacBook Pro and the store still said coming soon. Then i opened my Safari and BAM, was able to order- while Chrome was still stuck on coming soon.