Just called T-Mobile and at least for the plus they got nothing and they have no idea when they will come. They also have no idea when the pre-orders will actually arrive and all the dates they gave up to this point are void since they really have no idea how long the backorder will be. That's according to one I just spoke with.
Best bet for getting a new phone for T-Mobile is to get a Verizon model I think and just pop in the sim card.