The note direct from Amazon reads...

Wii Available for Purchase 12/29: The Nintendo Wii will again be available for purchase on Amazon.com on 12/29, Friday morning, at some point between 7am and 11am PST. We will be limiting purchases to one per household. We anticipate that we will sell through our inventory very quickly as demand for this product continues to be very high. At this time, we do not have any information on future Nintendo Wii offers, but we will post updates on future availability on this page.

Get your credit cards ready! Good luck to everyone! Thanks to Bollweevil for the heads up!