From the official press release:
Microsoft Corp. today announced that strong demand over the Black Friday weekend has propelled retail sales of Kinect for Xbox 360 to more than 2.5 million units worldwide since it launched just 25 days ago.
“We are thrilled about the consumer response to Kinect, and are working hard with our retail and manufacturing partners to expedite production and shipments of Kinect to restock shelves as fast as possible to keep up with demand,” said Don Mattrick, president of the Interactive Entertainment Business at Microsoft. “With sales already exceeding two and a half million units in just 25 days, we are on pace to reach our forecast of 5 million units sold to consumers this holiday.”
He says their goal is 5 million "sold to consumers" and also mentions "retail sales", not "sold to retail", but you know these press releases..
Link: http://www.microsoft.com/presspass/press/2010/nov10/11-29msxboxblackfridaymopr.mspx