"...Today’s update (version 844) of the Remote Desktop Preview client for Windows 10 adds support for both Windows 10 Mobile devices and Continuum for phone for compatible devices like the Lumia 950 or 950 XL. The client is still in development as we continue adding more key features including support for Azure RemoteApp. It’s been great seeing all the feedback and excitement for using this client on Windows 10 Mobile and on Continuum. This is a great time for you to make feature requests or report bugs and other issues you might have with the client as we prepare to come out of preview..."
Read the complete article here: http://blogs.msdn.com/b/rds/archive/2016/01/12/remote-desktop-preview-now-available-on-windows-10-mobile-and-continuum.aspx