Just found this...
"ignore those pre-order emails Amazon's been sending you, or the rumors you've been reading: Xbox One is not launching on November 27. Conveniently, that's just a few days before the United States' biggest shopping day of the year, Black Friday, but it isn't necessarily the date Microsoft's settled on for Xbox One. It's just Amazon's best guess.
“We have not informed our retail partners about a specific launch date for the Xbox One," Microsoft told IGN. "It is commonplace for retailers to put placeholders dates and prices into our system until they are given a specific date and price. We are excited to release the Xbox One in November 2013.”
http://www.ign.com/articles/2013/06/...-a-launch-date