The Raspberry Pi Foundation announced the launch of the Raspberry Pi 2 and that it will support Windows 10 and that you will also be able to get Windows 10 for FREE.
So if your interested in Windows 10 on Raspberry Pi sign up to the Windows Developer Program for IoT.
Microsoft announced the Windows Developer Program for IoT and put Windows on the Intel Galileo board. Today Windows gets even better for IoT and Maker scenarios by supporting makers on a multitude of other devices.
It's pretty clear that the way to go with Windows 10 from a developer's perspective is Universal Apps allowing you to run an app on a 88inch surface hub, windows phone or even IoT device.