Oh I'm sorry to hear that. There was certainly a piece of me that wished that he'd get an opportunity to say what might have happened in a hypothetical sequel to Chaos Child one day.
Obviously some of the setting was in flux, but I really liked the Inquisitor trilogy growing up. And it was always nice to see a book in a setting where there's a god of pleasure in which people even have sex sometimes!
RIP and best wishes to his family. He did a lot to establish the feel for what 40k is and should be appreciated for that.