Ubuntu has a feature where you can define remote sessions in Ubuntu One, then use these from the login screen in recent Ubuntu versions. See: http://www.omgubuntu.co.uk/2012/09/ubuntu-12-10-login-screen-adds-remote-desktop-access We could consider integrating with that.
We haven't seen any interest in this and I'm not sure the function even still exists in Ubuntu. Closing until we see more noise about it.