Less than a week to go. We gotta get some guesses going. For me, I hope Harry dies, though don't think she'll do it. And Snape will turn out to be good, simply because, well: Dumbledore is always right. Also, saw the movie this weekend and just loved it. Imagine it's near impossible for a non-Potter reader, but I'd rather us book readers be happy (screw you moviegoers who don't read!).
Also, for a truly great ending, check out this contest winning ending by Tamar Siegel, age 12. Love this idea.