Microsoft's second-generation Kinect for Windows sensor will be available to developers, alongside a new software development kit, in July. From All About Microsoft:

The sensor costs $199 and is orderable through Microsoft Stores. (A price list for other countries is here.)

Sensors purchased during the preorder period will be shipped in July, 2014, according to Microsoft. According to the Microsoft Store entry I see, the release date here is July 15. At that time, Microsoft plans to release a public beta of the accompanying software development kit (SDK) for the devices. The SDK 2.0 will be licensed separately. Developers can build applications for the new sensor with C++, C#, or Visual Studio Basic by using Microsoft Visual Studio 2010, according to the company.

General availability of the sensors and the SDK will happen "a few months" later, officials said in a blog post. Officials showed off earlier this year the new sensor design, as well as the hub and power supply.

 Microsoft Kinect for Windows v2 sensor available for preorder for $199