So here's what happened (fictional re-construction of events, not to be confused with the actual events):
Our MacPro units were at the front of the processing line on August 7th. They had top priority and were assigned numbers which set the order of processing. With the non-availability of ATI cards, these units were carted to an empty part of the warehouse, and there they sat. In the meantime, the ATI cards became available, and they worked off the new orders that needed the ATI cards. Thus people from Japan to Europe including Canadian and US orders got their MacPros in quick succession. Ours were forgotten. Sitting and gathering dust, despite the earliest order dates, someone may have discovered that these units were late. Sometime today, someone rounded a corner in the vast warehouse, and there they were. Amid complaints, shipping notices started to roll. Yes, I know that my MacPro is coming from Fullerton, CA, but so are many others...
How about that from a scenario totally built on speculation??
Not that I would mind someone from Apple actually reading this and saying "holy moly, we have a problem 😡 -- we gotta fix this!"