It's a pretty nice lounge - great staffers there when I used to frequent it. Makes sense that CO would move over there - plenty of room in that concourse - CO can easily take the former DL gates at 47/49 without displacing anyone.

Heck, given the downturn in traffic at GSO, they could easily move Delta back to their old gates at 47/49, have CO move into some of the US gates and mothball the rest of the airport since traffic is down so much there.