No, it's not in the new Alpine Manual. Of course, it shouldn't be, because the Alpine Manual is only intended to cover through Level 6--essentially, basic parallel turns on blue terrain.
Most discussion of "new slalom technique"--whatever you want to call it--has been in journals, newsletters, periodicals, and the Internet. And, of course, live conversation! Unfortunately, most of those things don't have indexes on the Internet, so it will take a trip to a good library, at least.
Nord--I wouldn't bother with USSCA stuff--anything written under that name would be too old to apply to this discussion. (Those initials now belong to the United States Slot Car Racing Association!)
Again, besides EpicSki itself (perhaps the most current reference of all), check the newsletters and discussion forums of the various regional Masters racing programs. Ski Racing journal has some decent articles on slalom technique, among other things. Foreign ski publications--especially European and Japanese--often have great technical articles, even if all you can understand is the pictures! Even Ski, Skiing, and Outside Magazines have had a few articles worth reading, and I'd expect to see more coming up.
Most of all though, Nord, since I don't suppose anyone here feels the need to be your personal research assistant or librarian, you'll have to find your own stuff. Tell you what I'll do, though. I have, sitting on my screen, a list of five relevant url's that I found this morning. Number one on the list is the article by Scott Mathers (who, by the way, I hope to see here at EpicSki soon). You start a new thread with a substantive discussion of Scotty's article, and if I get anything worthwhile out of it, I'll send you the next URL. Kind of like homework, eh?