I watched a couple videos from the shows this weekend and it looks like everything behind Jerry is just stage props. The older heads' lights were on but I doubt they or the cabinets on stage were being used. His front of house sound comes from iso cabs off stage right where his real racks should have been. It was dark, grainy video I watched but it didn't look like his effects were in the racks with the old heads and they would have been had he been using the heads.
Until Dave posted and I saw the videos I thought that his main rig may have still been in the studio, not sure what stage the album is in but they've been working on new material since last fall.