It is very improbably, but not impossible. I arrived on the scheduled pickup date and my 330 was not there because someone forgot to transfer it from storage to the delivery center. They gave me a loaner X3 that I used for most of my vacation. I did pick up my car when I returned to Germany about two days before the end of vacation.
Mistakes do happen, but overall it is very rare for a car not to be ready on the scheduled date.
Usually people are so excited that they check the 800 or OC a million times (or at least twice a day) before take-off, so for some god forsaken reason that it's not ready, you'll most likely know about it 4-weeks before hand.
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