Well, Suzie did say that whatever was moving in the darkness was 'coming for' Jack. So... seeing as he can't die, my initial thought was that it was death coming to get him. But now that you mention it, she doesn't actually say what kind of darkess it was. Maybe when you die, you go into the void... then it might be the Daleks.
But, because she said it was coming for Jack, I'm not sure how it could be the Daleks or the Cybermen. Might they have some sort of grudge against him? Maybe it is the Daleks, and they want to get him back for shooting them in DW (though I suppose they got him back by killing him... it's not his fault he got resurrected!). And I doubt they could remember, because they all died or something, didn't they? *fuzzy memory* Anyway, that would seem a little crazy...
I'm not sure what I think at the moment. There is the possibility, like you said, that it's something completely new. But it might well be the Daleks or the Cybermen... I guess we'll just have to wait and see.
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