we are guaranteed the full story in two books before Nov 2017!
No you aren't: "ESTIMATED DELIVERY Nov 2017"
He is writing from memory, rather than having to track down and interview people, so that improves his estimate.
However, if it really is "NO HOLDS BARRED" then it will likely have to go through a rigorous legal process before publication.
I didn't back Brians book as I had pre-ordered it on amazon years ago, fool me once.... However I would certainly buy both volumes in paper back.
I'd buy Davids book in paper back too, hard back books are too big and awkward. It is only really justified for books with lots of pictures.