First of all, like everybody else, I think that Snape will prove himself to be a good guy after all.
I think Wormtail will do a Darth Vader and switch loyalties in the last book.
I think any and all adults who could help Harry will be killed off so Harry will have no one to fall back on. (It was the reason Dumbledore had to go.) With the exception of Snape and possibly Hagrid—-one of them will most likely become the new headmaster at the end of the book.
And most of all I’m hoping that we’ll find out that it’s actually Neville, instead of Harry that the prophecy is about. I think Harry will horrifyingly fail at killing Voldemort and at the last minute Neville will step in and do the deed himself. (At least that’s how I’d write it.)
I also think that Harry will have a chance to see all of the characters who’ve died before and make peace with them. (Either from this side or the next—although I really hope he isn’t killed off in the book.) I’d love it if they all came back to life but that is probably too cheerful for J.K. Rowling. She seems very fond of funerals lately.
Oh yeah, and of course Ron and Hermione will end up together. I’d like for Ginny to be killed off as I found her extremely annoying in the last book, but I doubt that will happen.
I also predict that my editor will do absolutely no editing on my manuscript until he finishes the novel–in the book world this is sort of a holiday where everything shuts down. I should finish a couple of projects before I read the book, but I probably won’t because I don’t want anyone to tell me how it ends and what are the chances of avoiding that?
I’ll have to stay in my room, unplug the internet, or just hold my hands over my ears and hum loudly.