I feel the same way now after reading this. I pretty much panicked though when I saw the 9/20 date for delivery disappeared from the site. I just got off the phone with a rep and she stated if your order says "Backordered" then it's because they are waiting for the 19th, and it'll switch to shipping. Those who ordered on the 12th will get it on the 19th or 20th definitely if you did "expedited shipping/overnight shipping 24.99." If you are on the EIP plan, then you will not get the amount charged until it is "shipped."
So please check your bank transactions to follow-up when you know they're being shipped. If T-Mobile charged your account $0.00 or $1.00, then it's only to make sure that your bank account is valid, and to prevent fraud.
My only complaint I have with tmo is them being cheap and making customers pay for shipping. Everything I had shipped from Verizon was always free next day air delivery. I chose UPS ground, not only because it was the cheapest option or because I ordered two iPhones, but it showed estimated delivery of 9/19. I pre ordered as soon as JUMP! was available online on the 12th.