I don't think any of us can know what happened to our 7+, Matte Black or Jet Black until tomorrow.
I don't think it's as simple as Apple ships to T-mobile, T-mobile processes, T-mobile ships to us. I think it's more like a drop shipment, maybe with modifications that prevent the true origin scan (china) from showing up.
Also, the shipment estimate for all T-mobile 7+ colors except for Jet Black on Apple.com is 2-3 weeks. They can't be that far behind if you can order one today directly from Apple and get it in the time frame of most of our estimates (9/26 - 10/10 for me).
I think a lot of people who have already given up are going to be pleasantly surprised tomorrow.