DMC Port

So inside my system there is an empty expansion slot labeled DMC. I did a search a few weeks ago and found some information which indicated it could be used for a WiDi card... that was it's primary intention. However a couple of people also indicated there where internal 2 or 3 port USB hub/adapters that could go in this slot..... someone even indicated they HAD one. I have not been able to locate this card anywhere. Anyone have any ideas?

Thank you!