FWIW, I'm on the email list of Hillel, and when discussing that the book is done, he said the following, which makes me thing otherwise:
This marks the completion of a project that took five years of work, six bookwriting professionals, fourteen domain experts, and fifteen public alphas.
This has been, without a doubt, the biggest and most exhausting project I've ever done. The examples in the discarded drafts alone could make a second book. The cursed knowledge I've gained on LaTeX and typography could fill a third (or at least a couple of entertaining blog posts). Self-publishing was simultaneously the worst and best decision I made.
Now excuse me I am going to sleep for a month.