I think I read somewhere that Jack knew something that the Doctor didn't, or that the Doctor knew something that Torchwood needed to know, or...it was something like that. Not clear on whether that'll be the entire Torchwood season arc, or if that's just going to be a starting point (of course it would help if my brain could actually remember the quote, ahem).

That would be gutting, Jack getting left TWICE. But I sort of hope they keep away from the Tylers, and let Jack start over a bit. He needs to be all broody and wanting to prove himself, only fucking up as the one person who showed him what a good guy he was capable of being is gradually revealed by the Torchwood files to have been as much a cause of disaster as of good...?