According to this pre-order page on the Microsoft Store, the Kinect for Windows v2 Sensor will be available for Windows PC users on July 15. One of the curious things about the page is that it lists the motion sensing camera technology for $200. That's about half the cost of buying an Xbox One without a Kinect. Hopefully this will not be the price when it releases the standalone retail version of the device sometime this fall for Xbox One.
Microsoft began offering an Xbox One retail SKU for $399 in early June, $100 less than the SKU that comes bundled with Kinect. The concern is that those who opt to be the cheaper of the two SKUs will ultimately pay more for the Kinect stand-alone SKU later on down the road if they feel the need to buy it.
Then again, this could simply be a case of the device - which is geared towards development and not consumer use on Windows PC - costing more because it is meant for developers. Incidentally, those who do want to develop stuff for Kinect on Windows will have to license the Kinect for Windows SDK 2.0 separately for an undetermined amount of money...
Thanks to Andrew Eisen for the tip.