They have pretty consistently released books that deal with subject matter taking place BEFORE episodes that have already aired. So we got Owen and Tosh stories after they'd already been killed off, as well.

Bear in mind, John and his sister Carole are writing a Torchwood novel. I've e-mailed her to ask what it's about, since they were completely mum on the subject at the last con (they were even iffy if they should admit to writing it at the time, since it was pre-CoE). Hopefully that means it's something to do with Jack's travels, but that could just be me being hopeful. I'm sure she got inundated like everyone else did and is still catching up.