Microsoft doesn't want you to confuse Kinect for Windows with Xbox 360 console-based Kinect peripherals that have been forced to work with PCs. These are two separate things. The company confirmed during yesterday's CES 2012 keynote that the official Kinect for Windows release is happening on February 1 (via Gamasutra).
There's no price announced, but Amazon pegs the number at $249.99 (via Major Nelson's Twitter). That's a full $100 more than the MSRP for the console version of the peripheral. The PC version of Kinect was confirmed last year to be an improved take on the Xbox 360 release, highlighted by an ability to detect objects in close proximity to the camera lens.
You can probably expect to hear more on what this Kinect for Windows release entails as CES week continues to unfold, so stay tuned to G4 for more.