Taking the layout from the airport master plan, the light blue on the left is the current Center A SkyClub. The slightly darker blue area on the right would be the area of the new SkyClub, that was formerly the LH lounge and also has been uses as a conference room.
Not sure where the access will be, as I doubt TSA will let the put a door and/or have passengers come across or up to the balcony to access, so my guess it will be accessed over behind the tram escalators near the "Need Help Desk" at A43. There is already a staircase internally there, but I assumed that to access the ramp tower.