ESpen36

It will be located above the main concourse across the big hallway from gate 12. When you come through security, you would under a bridge of sorts. At each end of the bridge are elevators. Go into one of them and you will see the button to press that already says "Admirals Club" and "Flagship Lounge."

Another way to find it is to look to the right, toward the entrance to the temporary Admirals Club (not worth a visit, doesn't even have drink chits). On the right, you will see an elevator and stairs up to where the new club will be.