Back when I was at AOL in Vienna, VA, there was a bookstore called Computer Literacy Bookstore, a few doors down from the headquarters of Ringling Brothers & Barnum & Bailey Circus (who annually would show off their elephant-de-jour).
I bought the first two editions there the moment I became aware of them. They're signed in pencil by Knuth himself. The fact that he used pencil I found amusing.
I bought the third edition, which was a huge, huge event as it was much anticipated, and enjoyed it better than the first two since I have rather poor mathematical ability and could relate more to the fuzzy concepts of sorting and searching than some of the more mathematical concepts in the earlier two editions.
Since I left the software engineering community in favor of what we used to call "systems programming" and now call "DevOps," I didn't become aware of the "4A" edition until this evening. Thanks for the heads-up. Maybe it will encourage me to get back into software engineering and overcome my weakness in math.