The Apple Store here told me they got nothing today when I called. Maybe they got shipments today and aren't selling them till tomorrow? The employee there told me they don't sell shipments the same day they get them, and since they don't get any on Sundays, it makes sense.
I've talked to a few Apple store workers over the past week. At least here in SE Michigan, they tend to get thier shipments via FedEx around 2-3pm in the afternoon, and that stock is what becomes available in the online ordering system that night for in store pickup the next day. If they get a shipment on Monday afternoon, they do not make it available on Monday.
What time did you call? Maybe they just hadn't received their shipment yet? Or, maybe they really didn't get a shipment (they don't always get one every day). Either that, or they have been getting tired of people calling them and asking if they got a shipment today, for reservations tonight and are just saying they don't know if a shipment came in, when they really do (I've run into a few workers who have done that too).
Good luck tonight!