Today Microsoft has released an update to the Kinect for Windows 2.0 SDK. This preview SDK update brings a range of improvements which enable developers to make applications using Kinect. This update has over 200 changes which should make developing easier and faster. Microsoft thinks these additions will help make better more stable apps using Kinect. The SDK is free for anyone to download and use. Microsoft is also letting commercial applications be developed with no runtime licensing fee! The V2 Kinect sensor is $200.