It sounds like the answer is no:
Q: Will the insiders have to reinstall W8 to register for the W10 upgrade?
Yeah, there's no way that I'd go through that (and Symbols, as I recall, are a huge download encompassing scores of files).
I see that there's a "WindowsUpdate_AU_deprecated.log" file that'...
It could have been in reference to BYOD. Apple has huge numbers of iPhones, iPads, and even laptops in the hands of those in the U.S. (especially), and businesses have to deal with them.
One thing that a lot of people are seeing is WU displaying 0x80070057 instead of working, preventing people from getting KB3034229 (though there is a manual version of that update available for...