One of the things I like about ACTA and Mongoose is they don't get all GW on us about sharing information and rules (until now?) The ships are all online in several places (thank the lord) and it makes for a better gaming experience.
No one will play this game without the books. No one is so desperate to play this or any other tabletop game, imo, to piece together rules from internet posts. Even if someone had the entire rule set I doubt they'd do it short of a pdf that exactly mirrored the books.
What keeping all this light under a bushel does is leave a bad clique taste in prospective players mouths. Enthusiasm for the game will come from playing and community and coolness - "go buy the rules, you deadbeat" doesn't work. It may get someone to buy a single book, but by sharing now and "giving a free sample," so to speak, you'll get a fan/customer who'll buy many books and models over many years. If you want to help Mongoose, help the players.
Besides, I also think that if the only thing of value in the Dilgar book could be summed up in 2 sentences Mongoose has done a disservice to its fans by putting them in a book. Such little things llke that should have come out in S&P. Of course if there are scenarios, special characters, great pics, background etc the book will be popular and sell even if everyone knows the 2 new rules.
Further rant: I was peeved that the rules for Dilgar didn't appear in Armageddon. I think that new hardcovers should replace all the previous softcovers as a compendium - no on likes carrying a thousand books if they don't have to and ACTA with it's sleek rule set and even with all the ships shouldn't be more than 2 books.