I love the FF 40K RPG books. They have been amazingly well put together! Fantastic art with deep fluff and an engine the provides for the satisfying crunch!
I do have a question/suggestion for the 40K books; Will there be a master rules? With every new book (DH -> RT -> DW -> BC) the rules are tweaked and subtly refined. I will now be using the Black Crusade rules for all my 40K GMing, and could see a master rules being very helpful! It could keep the previous books up to date without needing any new editions of individual tombs.
Just my 2 cents, and keep up the good work!