Pretty sure there was an issue with T-Mobile phones only, some glitch in the system as mentioned earlier. No other carrier had this happen. I literally ordered the FIRST minute at 12:01pst and when I clicked to buy, it said 'delivers Nov 3' but then when I got the confirmation email it said nov10-nov17. I was not happy at the time and thought there may be some underlying problem. I don't think there is just magically more stock like some are suggesting, or less demand.
I had this issue where it said Delivers Nov 3 and then switched to Nov 10 to 17, but I'm not a T-Mobile user. This was VZW. I did order very early though, confirmation email arrived at 12:02.