Also includes updates and additions to the Windows namespace. See the Microsoft blog post for the full list of API changes under development and new, or updated for this release of the SDK.
The SDK will require Visual Studio 2017 Preview. You can download the Visual Studio 2017 Preview here. The Preview SDK is a pre-release and cannot be used in a production environment. Microsoft suggests developers should only install the SDK on their test machines and if they are working on an application that they need to submit to the store, developers should not install the preview.
The Preview SDK can be downloaded from developer section on Windows Insider.