A:Answer My girlfriend ordered one at 6:20am Pacific Time.
She was logged in and the coming soon button changed to please wait and then it turned yellow. You have to immediately put in cart and start the checkout process.
I read a blog that says Walmart is releasing inventory at 12pm, 3pm, 6pm, and 9pm Eastern time. I can't find any info about Best Buy but maybe they are doing the same thing.