It wouldn't be quite that simple because both currently and in the plan all concourses are not the same size so it's not going to be a case of moving everyone in D to E or whatever, although hopefully the airport and architects have planned for the long transition phase. First, there will be a completely new Express terminal on the east side of 17/35, into which Express could move before reconstruction started on the current and new concourses. After tearing the current F down, a new F & G-Con could be built - F will be slightly north of the current F with G to the north of that. E could move into F/G then be demolished (E is also being moved slightly) but with no terminal and just a corridor connecting F/G to the end of the terminal where E is being demolished/rebuilt it could cause a passenger bottleneck. After E is completed, D could be demolished and relocated, but it appears that the new E/F/G won't have as many gates as the current D/E, so there could be a shortage of gates till D is completed. At any rate, once D is complete, C would be demolished and relocated, but again D may not have enough open gates to replace all those on C in the interim. Once C is completed, B could be rebuilt, but with a loss of gates at the end (though more than offset by the total gates in C/D/E/F/G).
In short, there would definitely be musical chairs of particular airline's gates during the entire construction period and US could end up using B/C and part of D when it's all complete (assuming that the A's remain unaffected for international/some domestic the whole time).
Jim