That's been what's bugging me too, and when I ask on these forums, people will say emphatically that there is no delay and they won't be sold out ("this is a major company, not some mom and pop ebay store" as one poster put it), or on the other end other people say you could have to wait 3-4 weeks. But in my opinion, if you have to wait 3-4 weeks just from waiting for 6 days, you woulda had to wait a long time anyway even if you order tomorrow.
Of course, if you're fine with the default configuration, you could just go to an Apple store and pick one up as opposed to ordering online.