A variety of factors and circumstances at Oghma Creative Media (the book’s publishers) were contributing to projected delays in the book’s original release date of December 20, 2017.  These were mostly beyond their control, and also largely affected by their more-rapid-than-expected growth and successes.
After a long discussion with Oghma in late December, it was jointly agreed to collect the latest material and columns from the past several months, add them to the previous content, and produce a longer book.  This will take time, of course, but Oghma has agreed to expedite the renewed schedule, and the new release date is now scheduled for August 14, 2018.
This development, while somewhat disappointing, has several win/win upsides, (including more time to promote Rollin’ Down the River! 🙂 ), and I am actually excited.  More details, opportunities, and options will be forthcoming later this Spring!