I was watching this thread and signed up after a nice lil chat with spring rep.
I asked if mine was in stock or do I have to wait for it to ship from overseas. She said, "first come, first serve".
So they are in stock and being sent in order. No other details after that as she never replied.
First preorder for me. Upgrading from 6s 16GB and preordered the 7 Plus 128GB Black. Placed order on Tuesday in Sprint store @8pm

A few hours difference and it added over a week to the wait.
Product ID Description Qty. Order Date Tracking #
*** IPHONE 7P BLACK 128GB KIT 1 2016-09-13
Status: Your order for the iPhone 7 Plus Black 128GB has been received and will ship by 9/30 if ordered before 11AM CT on 9/13. Your order will deliver by 10/10-10/19 if ordered after 11AM CT on 9/13. You may track the progress of your order at
www.sprint.com/myorder. Additionally, keep an eye out for a shipping email with your tracking information. Thank you for your patience.