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My guess (and it is a guess) is that if the August 2020 is in any way real, it's probably based on a tentative delivery of the manuscript around the end of this year or early next. I don't know...

Believe me, I hope it is August 2020. I'm just skeptical that there's good evidence to think that's a real date.

I wouldn't believe anything unless it's announced by the author or publisher. Rothfuss himself has recently given no guarantees on when it will be done. Any dates you see at this point are fiction.