SIBS is part of The Secret History, but is not listed as such in the Young Adult Jack books, as it is possibly inappropriate for the YA audience:
http://www.repairmanjack.com/forum/showp...ostcount=2
As for the revisions, specifically with regard to the Borderlands hardcover editions of a few years back, FPW sez that THE TOUCH and REBORN were cleaned up and modernized, while the revisions to REPRISAL are a little more extensive:
http://www.repairmanjack.com/forum/showp...ostcount=2
I recall FPW saying that the original version of THE TOUCH was overly grounded in the 80s, and in bad need of modernization. The most recent version of THE TOMB has some small updates (Jack now has a DVD player, instead of a VCR or Betamax, as Ken mentioned). And while it would be sort of impossible to modernize THE KEEP, things like the use of passive voice and 30-year old grammatical errors have been revised.
I'm really looking forward to seeing what the revisions to REPRISAL (beyond those made for the Borderlands edition) will be present in the forthcoming trade paperback.