Did your original order go back to "processing" status on the Apple store? Do you have 2 order dates in the system, or was your original date just updated?Same boat here, except I got a second ship date from Apple with a delivery date of 12/22, like I was ordering it new today.
I wonder if Apple automatically starts a new order if existing order deliveries get screwed up as has happened in Shanghai.
I recall I had a similar issue with an iMac order a few years ago. Order got "re-started" But it was only delayed a few days.