I believe it will leave China on the flight the next day or the next business day. Mine had similar journey but because of the cut off, it was on the plane the next day...so much for the next business day as Apple promised

Ordered 11/30 at 8 pm Chicago. Went to preparing to shipment on the evening 12/19. Here is the info...
Date/Time Activity Location Details
Dec 22, 2012 1:45 AM Arrived at FedEx location INDIANAPOLIS, IN
Dec 21, 2012 4:14 PM Departed FedEx location ANCHORAGE, AK
Dec 21, 2012 2:08 PM International shipment release - Import ANCHORAGE, AK
Dec 21, 2012 12:38 PM Arrived at FedEx location ANCHORAGE, AK
Dec 21, 2012 7:59 PM In transitSHANGHAI CN
Dec 21, 2012 7:59 PM International shipment release - Import SHANGHAI CN
Dec 20, 2012 5:56 PM Left FedEx origin facility SHANGHAI CN
Dec 20, 2012 5:55 PM Picked up SHANGHAI CN , Package received after FedEx cutoff
Dec 20, 2012 2:53 AM Shipment information sent to FedEx