"I have the 1981 second printing (And/Or Press), and I had no idea – until recently – that a later edition (Ronin, 1997) had a brand new introduction added by RAW."
I had no idea, either. My edition was published in Great Britain by Sphere Books (I certainly didn't buy it over there), but it's apparently based on the And/Or Press edition. So I haven't read the introduction, either, although The Illuminati Papers is a favorite of mine.
RAW Semantics offers a quote from that introduction:
"This book dates from a barbaric, almost pre-historic age—over twenty years ago. You will realize how far back in the abyss of time that near-Feudal epoch looks in retrospect when I tell you that I wrote the entire manuscript on a typewriter. Of course, we had electric lights instead of candles, and the 'horseless carriage' had come into general use, but otherwise the so-called advanced nations remained in a primitive industrial economy and few could foresee the Information Age dawning."
There also some nice discussion of jury nullification at the post.