From the new website of Kinect for Windows，Kinect for Windows SDK Beta 2 is released.
The Kinect for Windows SDK gives developers easy access to the capabilities offered by the Microsoft Kinect device connected to computers running the Windows 7 operating system and Windows 8 Developer Preview.
It includes drivers, rich APIs for raw sensor streams and human motion tracking, installation documents, and resource materials. It provides Kinect capabilities to developers who build applications with C++, C#, or Visual Basic by using Microsoft Visual Studio 2010.
This SDK is designed for non-commercial purposes only; a commercial version will be available in early 2012.
New in this release:
Faster and Improved Skeletal Tracking
With updates to the multi-core exemplar, Kinect for Windows is now 20% faster than it was in the last release. Also, the accuracy rate of skeletal tracking and joint recognition and been substantially improved.
Status Change Support
You can now plug and unplug your Kinect without losing work/productivity.
Improved Joint Tracking
Substantially improve the accuracy rate of joint recognition and tracking.
You can download the SDK here.