Do we know if there will be any more books?
Dark Heresy has quite a few books now, with a pretty sizeable bulk of content. While it's nowhere near such bloated hulks as GURPS or D&D 3.5, I can't help but wonder what's coming next. Deathwatch seems to be in a similar spot, with little left to make but adventures or rules for more chapters.Only War is wrapping up its beta soon, and once it releases we'll have a nice wait before we get anything further for it. Black Crusade should be getting a further three books (one for each god) and Rogue Trader is safe as long as they can think of more xenos to include, but I have to wonder: what's left for 40kRPG?
The reason many people see the DH psyker rules as broken is because they are! FFG has used some variant of the current (psyker) rule system since rogue trader. The Only war Sanctioned battle psyker character is nothing less than a rewrite (or revision) of the DH sanctioned psyker. I'm not sure how much clearer they could be without publishing Dark Heresy 2.0!