Win 10S availability

At this point Windows 10 S is only available with new HW. The Surface Laptop is currently shipping as of June 15th.
For developers we have a simulated policy so that you can ensure your Store App or Driver are compatible. Details here: https://docs.microsoft.com/en-us/windows/uwp/porting/desktop-to-uwp-test-windows-s#first-download-the-policies-and-then-choose-one