It will be the latest in 3d rendering software by Microsoft which no gamer will be able to live without and all new games and cards will support and a d/l will be available in the future for those who do not have it.
It's really not that big of a deal, just the latest...
There should be a patch for most if not all cards. It has more to do with how your OS interacts with your hardware then the specific card itself. Hard to explain.