Yes I am updating the book. No I'm not done yet, thanks for asking. I'm only on page 6 or something but since it's only a 44 page book its a happen as the kids say. No big changes as yet, I've tried to clear up some of the wording on starting Hit Points as well as a slightly better explanation of how to assign stat and skill bonuses and difficulty. The real changes in this draft are going to be the damage modifiers for stats and making weapon ranges simpler to handle with a quick short/medium/long range modifier instead of all this increment stuff. I was also toying with the idea of getting rid of dual wielding all together since it takes up so much mechanical space and there isn't much return on it but I'm not sure I want to revise all that this late in the game. Someone out there probably wants to duel wield claymores I'm sure.
I also wanted to give a shout out to Stork at Happy Jacks RPG podcast. I was listening to their last podcast* on my way to Hamilton and heard him mention Beacon in a non-derogatory way. I always like that. Stork has often said kind things about Beacon - so my thanks to him and all the Happy Jackers. One point I'd like to clear up however: Stork did happen to say that Beacon was an AD&D clone and it isn't. Beacon is based on Microlite M20 and both are derived from the d20 OGL so its closer to 3rd edition or Pathfinder in it's core mechanics than AD&D. That means rolling d20 vs Difficulty Class as a unifying concept instead of just one of many resolution mechanics. This makes it pretty easy to convert d20 materials into Beacon use. It also happens to be a rather close to 5th edition D&D although that wasn't around when I was designing Beacon (and no I didn't check out the play-test material - I had low expectations of D&D Next which I am happy to have been proved wrong about).
Beacon does have a lot of modern game mechanics but it is definitely an old school inspired application of those mechanics. So if you came here looking for AD&D you should go check out OSRIC or the Labyrinth Lord Advanced rules. However, if you came looking for a light and fun free D20 system you could do a lot worse than trying Beacon.
OK, my nerdish diatribe is over. I do have one last update however. The Roll20 character sheet for Beacon is looking pretty good. I hope to put it through some paces and see it roll out soon.
*it was the Swords & Wizardry Day episode I believe.