Here I asked a question about moving from LaTeX to plain TeX and one of the recommendations was to look Knuth's TeXBook.
I was looking into this when I came across this update on Knuth's website, money quote:
The original editions of these books were produced with the technology of the 1980s: I supplied “camera-ready copy” (produced with TeX and METAFONT) and the publishers used a special camera to photograph that copy and to make negative images, from which plates could be produced for use on offset printing presses. Many illustrations were prepared first as photostats and “stripped in” by hand, using an interesting process called “waxing.” Shaded parts of the illustrations were photographically “screened,” etc.
Dozens of subsequent printings, including those of the Millennium Edition, were made from the original camera negatives, with replacement pages inserted when necessary but with the original illustrations retained.
But finally at the end of 2011, when it became necessary to reprint these books again with all of the latest corrections that have been suggested by the world's best nitpickers, the publishers discovered that the original films had been lost! That was bad news for me, because it meant that I had to put The Art of Computer Programming on the back burner for a month while working hard to reconstruct more than 2600 pages of highly technical material, including the remaking and placing of more than 1000 illustrations. But it was good news for everybody else, because now the latest printings are produced entirely with technology that can be expected to last for many generations, and the books themselves are significantly better in hundreds of small ways. I went through every page very carefully and introduced many refinements, which have made me extremely happy with the result. I'm now able to replace my personal desk copies, in which hundreds of handwritten notes had been scrawled since the Millennium edition came out, by fresh versions that are essentially perfect (as far as I know). This is especially true of Volume B, because important updates to the TeX software that were made in 2002 and 2007 have never before been available in print.
These new and updated printings of Volumes A, B, and C became available in April, 2012, including a new paperback version (12th printing) of The METAFONTbook. Hardcoverwise, the new Volume A is the 19th printing; the new Volume B is the 9th; and the new Volume C is the 8th. New printings of Volumes D and E are also “in press,” but not yet released.
So my question is whether the copy sold on Amazon.ca is in fact the new "spiffy" editions Knuth is talking about, or are they trying to run down their inventory of the older editions first.