don't know. the season finale almost seemed like a series finale. doesn't bode well...

(1) What the Doctor (the copy) did would only have taken out the daleks on and around the Crucible. If there were any daleks in a different region of space (or time), they would have survived. However, it's unlikely that there were any daleks somewhere else, since the daleks were counting on that reality bomb to succeed, and any daleks elsewhere would have been destroyed by it. But the daleks are ruthless, and it is always at least possible that they seeded a few other parts of the universe with daleks "just in case". (2) Also, don't forget that in parallel universes, the daleks may exist (even have won the Time War). I always wondered about that... surely the Doctor, the time lords, and the daleks had at one point existed in the parallel universe where Rose now lives ("Pete's World"), or else history wouldn't have turned out so similarly. Maybe in that universe the Doctor died ending the Time War. I just wonder about some historical events that the Doctor was involved in, like stopping the Gelf in the 1800s, or causing the volcanic eruption in Pompei. Are we to believe that these events never happen in that parallel universe? Or maybe it's that they were in the past, and so the universes hadn't split into parallels at that point, so the Doctor's involvement still happened. Does that make sense? I mean, the parallel universes idea in Doctor Who is based strongly on the "Many Worlds" interpretation of quantum mechanics, and in that, every apparent "collapse of the wave function", for instance caused by measurement, or particle interaction, spin off different universes, where all the possibilities happen. (3) The daleks in the Void may find a way out, back into our universe. If they built a void ship, then they have the technical know-how to do this. I think this is very likely, because the Void is supposed to be pure nothingness, and if things didn't just basically get annihilated when they "went" there, then I suppose it really wouldn't be nothing after all. (4) Davros may have survived, and so too, might Dalek Caan. Davros usually was pretty good about surviving. In fact, many times he has begged for mercy from his enemies, when he was unsure about his back up plans and survival chances. His arrogance at the end of "Journey's End" and unwillingness to accept help from the Doctor strongly suggest that he got away. Davros is thus the most likely candidate for a dalek return, in my opinion. Caan (probably) wouldn't try to resurrect the daleks, because for one thing, he may not be mentally coherent enough to do anything at all, and for another, he helped, in a way, the Doctor destroy them, and openly said he decreed "no more" to the daleks. But Caan is insane, and resourceful. So who knows what he'd do.