
At BUILD 2015, Microsoft released more details on Windows 10 for IoT devices, which includes Arduino, Intel Galileo as well as the Raspberry Pi 2. On their website, they have beta images of Windows 10 for the IoT devices and it is available for download for users who have signed up for Microsoft Connect. They have released a full set of instructions to get started with, which requires you to have a PC running Windows 10 build 10074 and later. I will leave the relevant links down below for your reference.
Setup Windows 10 beta on Raspberry Pi 2:
http://ms-iot.github.io/content/win10/SetupRPI.htm
Sign up for Microsoft Connect:
https://connect.microsoft.com/windowsembeddediot/SelfNomination.aspx?ProgramID=8558
Image Credits: Engadget