Who said that? It is still in the win 10 preview builds.
Last I read it was essentially the same WMC from windows 7 that was put into windows 8, with no (or very minor) updates, put into windows 10. As with windows 8, users will no longer get it automatically with windows, you'll have to pay for it separately -- a complete ripoff IMO, and one of the things that really soured me on win 8.
