I walked the length of D last week, 3/10. The only visible construction was close to the AF lounge near D9 (between KLM lounge and AF lounge). I asked one of the workers if this was going to be the new Amex lounge but he said he "did not know what they were building". A quick peek through the door revealed several old pay phones still on a wall but I could not see anything else. There appeared to be very little progress toward whatever they are working on.