I love the references to old episodes and hints at future ones. That's one of the things I really like about Doctor Who: the way that, even though the stories are mostly seperate from each other, there are still all the links tying it together as a series.

I did hear that Jack would be back in the third series! However, all this stuff about Torchwood is starting to make me wonder whether he's going to return as a companion or as an antagonist. I never really doubted that he would go back to being a companion before, but now...