Hi, I am Fliir aka Immanuel Guenther, the other author of the book.
Yes it would have been a good idea to write such a book even some years earlier. But also with the shading refactor coming within the next year, our book won´t lose its purpose. It was our aim, to write a book that helps with material creating far beyond the adjustings in Blender. The technical instructions are only a part of the book. Two other important issues are the analizing of surface and material effects in nature and man made environments and the knowledge about the difference between expectations of our seeing and what´s really there. So this book is also about the understanding of materials in a physical way and about the artistic way of analizing the environment. And these parts will also work with a new material system in Blender.
We hope, that our readers will also be able to create materials within other systems, when they adopt our method of understanding materials as their own. But that remains to be seen with the readers experience with our book and their feedback to us. We are really excited
If it seels well in German, we are looking forward to translate it into English, but not without professional help by our publisher. We are not experienced enough with English, to do this within 3 weeks without a definite deficit of quality (“definite deficit” sounds good :D).