: Work on this volume is planned to follow the completion of Volume 5 and a subsequent major revision of Volumes 1–3. Warning Regarding Unofficial PDFs
If you're interested in computer programming, software development, or computer science, do yourself a favor and get a copy of this volume. It's a valuable addition to your library and a worthwhile investment in your professional development.
Almost certainly, yes—but only after print publication. Knuth loves paper. He has stated that the physical book is the "official version." However, his publisher (Addison-Wesley) now routinely releases ebook editions alongside hardcovers.