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I honestly think Snape and Dumbledore didn't agree on the whole killing thing beforehand. I think at that moment Snape was working on the bad guy side, though I'm not entirely sure his intentions were evil.
I think Harry will go back to school, but not for an education. Dumbledore's office and things were there, and Harry might need them to figure out the locations of the remaining horcruxes. I don't believe he'll spend the majority of his time there.
What I am the closest to certain about is that Harry is a horcrux.
-Dumbledore said himself that Voldemort was probably planning on making a horcrux when he killed Harry, so Voldy would have been performing the spell for a horcrux at the appropiate moment.
-Voldemort had just killed two people, so his soul would have been properly severed.
-It has been noted several times throughout the books that Harry has this weird connection to Voldemort. He can sense Voldemort's thought and feelings, he has visions through Voldemort's perspective, he inherited some of Voldemort's powers, and so on. And no one can seem to explain this connection. Dumbledore even says "Unless I'm much mistaken, he transferred some of his own powers into you the night he gave you that scar. Not something he intended to do, I'm sure..." to which Harry replies, "Voldemort put a bit of himself in me?"
-The prophesy said that Voldemort would select the person to be his rival, and the only person capable of killing him. This makes sense if that person becomes a horcrux, because only the person with a bit of Voldemort's soul would be the one capable of making Voldemort mortal.
Because of this, I would not be surprised at all if Harry ends up having to kill himself in order to destroy Voldemort. In fact, I'm almost positive Harry will die in the end of the series.
If Harry does not die, however, I think it may be because of clever use of the Dementor's and their terrifying Kiss. They do suc.k out your soul...if the dementors could somehow suc.k out Voldemort's soul, but not Harry's, in an attempt to Kiss Harry, I think that would be a reasonable solution. (Though in all honestly, I just think Harry is going to die).
Um...that's about it.