To be fair its not a DX11 demo, its a DX abilities demo. You can do what they did already with 10.1. For most part its just the new engine they are touting to take advantage for it.
Not sure about eve engines, but that is the thing that holds back lots of games is the engine just does not support certain features.
I remember DX9 release they had similar demos showing off stuff like this, though it was NOT in a real game just a nvidia tech demo i believe.
Its pretty awesome demo though! To bad even online is boring