The new Kinect for Windows hardware and accompanying software will be available on February 1st, 2012 at a suggested retail price of US $249.
Kinect for Windows hardware will be available, in limited quantities at first, through a variety of resellers and distributors. The price includes a one-year warranty, access to ongoing software updates for both speech and human tracking, and our continued investment in Kinect for Windows-based software advancements. Later this year, we will offer special academic pricing (planned at US $149) for Qualified Educational Users.
For more details on this announcement see http://blogs.msdn.com/b/kinectforwindows/archive/2012/01/09/kinect-for-windows-commercial-program-announced.aspx