9/23 Postal Service update:
I finally got Apple on the phone and she said the 'system is so overloaded' and all of the orders are still processing. She said she had never heard of postal service delivery and it's always been UPS or FedEx in the past. She said she nor I can make any changes to the order now, and that it will take hours (up to 24 hours) to allow changes to be made to the order. I suppose I'm going to keep stalking my order for an update and then consider changing to in store pickup if spots remain available at my local store.
It just doesn't add up since 9/16 delivery was still readily available for my 256GB Black Pro up to an hour after my order where I got 9/23 postal service. Either the 9/23 thing won't be true and it will come by 9/16 or Apple is introducing the postal service option and randomly assigning orders to it since a lot of you folks in here ordered immediately and got 9/23 postal service.