I received an update from Amazon and now my D800 shipping date has changed to March 20, 2012 (I ordered mine few seconds after they started accepting pre-orders):
We have received new release date information related to the order you placed on February 06, 2012 (Order# ***). The item(s) listed below will actually ship sooner than we originally expected based on the new release date:
"Nikon D800 36.3 MP CMOS FX-Format Digital SLR Camera (Body Only)"
Previous estimated arrival date: January 04, 2013 - January 08, 2013
New estimated arrival date: March 23, 2012 - March 27, 2012
Obviously the previous shipping estimate for January 2013 was a mistake.