Just got off the phone with a rep from the office of the president at T-Mobile and he said: "Don't quote me on this, but even if you get in right away at midnight with your order, I'd be surprised if you get your phone before Christmas. The supply is going to be that limited." They have a iPhone X team meeting in 2 hours to go over details of the launch and info may change, but he didn't think they would be getting allotted a very large amount of the available stock of phones until early next year. Not great news...
I asked if he thought T-Mobile stores would get any stock on Nov. 3rd and he said he thought they are required to get at least one of each model/size and that's literally all they may get. A new T-Mobile store opened in a small strip mall about a half mile from my house - I may camp out in the parking lot if it goes as badly as I think it might tonight