Oh weird, I wasn't aware they still haven't release it yet. It's been 19 years since the 2nd volume. That's really odd. They didn't fulfill the preorders in 2014 either https://www.amazon.com/gp/product/0684873176/

I thought making it through the other two 700+ pages of letters was quite an achievement. I was planning to read the 3rd one at some later point in my life.

I guess I'll still have to wait ... the title was really great too "The Mutineer: Rants, Ravings, and Missives from the Mountaintop, 1977-2005".