MS is currently using Win8 Desktop to try and get people to use their (Win8) Touch user interface (the MUI). I suppose that after a few years, they'll reckon that they can't convince any more people to use Win8 tablets with Win8 Desktop, so they'll just get Windows to have a usable Desktop experience again.
A new and improved Start Menu, better looking again (not the ugly rectangular shapes), userinterface elements with a size suitable for mouse use, etc.
I find that just installing Classic Shell in a Win8 Virtual Machine is not enough to get me to like the experience. It's that Win8 is such a big compromise between Mouse and Touch, that ticks me off. I find it plain ugly.