I ordered from Chapters/Indigo (completion of order 12:10am ET on 8/30/16). I know some people got their shipping notices that same day, but I'm guessing that Kobo then lowered the boom and said No Shipping Until Release Date, stifling any further shipments by Chapters Indigo until 9/6/16. That's when I finally got my shipping notice, and it's made its way to "a foreign country" (aka U.S.A.) today, with an expected delivery date of 9/9/16 (shock! moved up from the initial long-time estimate).
Anyway, once it reached the US via Canada Post, I seemed unable to track further. But thru Google, found this site that can recognize tracking numbers and follow them thru different carriers:
http://www.17track.net/en/
It seems to be doing its job; it's able to tell me "Your item arrived at our USPS facility in JAMAICA, NY 11430 on September 8, 2016 at 2:37 pm. The item is currently in transit to the destination."
Hopefully it will continue being able to give me tracking info (will it stay with USPS, or go to UPS?). But at least it's left me feeling I know more than where it left off from Xpresspost USA (the Canada Post variation).