Here is an excerpt of an email I just received from my DS.
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Hope you had a great weekend! Your Model S has arrived over the weekend along with a few others. They are being made ready for delivery however the factory has given us strict guidelines that new firmware has to be installed on all cars prior to us releasing them. With that being said, we are waiting on the firmware update to be released from headquarters. Right now they have not provided us with any specific day, however I do not expect it to be too long. I will update you tomorrow with a more firm update in hopes of getting you behind the wheel here very soon! I would love to have you scheduled for Wednesday, however I want to avoid over-committing until I have a firm answer on timing on my end.
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Will let you know when they release my Model S for Delivery.