American is moving to C30-38, and they are building a new Admirals Club there. BA will still depart from A, so I'm not sure what will happen with the current Admirals Club.
Delta is moving to the former AA gates in A. I'm not sure if they are getting a new Sky Club, or if they can do a lounge shuffle to get the current Sky Club more space.
The rumor is that DL will soon take over the Admirals Club and the entire lounge area will become a SC. That whole area was once a massive Continental lounge. That's why there's the massive desk just past the entrance by the elevators.