I am a dangerously obsessed Harry Potter fan. (Of the books, the movies are good as movies, but they suck bigtime as adaptations). I've read the first four books several times each and I'm more than halfway through my second read of the fifth book.
To the person who said that HP is not for kids, I agree! The first book may have made it seem like that, but even JKR herself has said that the first book was that way just to ease Harry and the readers into the wizarding world.
Anyway, in Half-Blood Prince (book 6), I think that there are going to be a few deaths (obviously, the wizarding world is officially at WAR again since the end of Order of the Phoenix) but I don't think that Dumbleldore will die until the 7th book, if he dies at all. From what JKR has told us
www.jkrowling.com (SPOILER WARNING, DO NOT READ ON IF YOU DO NOT WANT SPOILERS) there is going to be a new minister of magic, and, contrary to popular belief, it is NOT going to be Arthur Weasley (I wanted it to be him too). Hermione will be turning 17 shortly after the school year starts, and Ron will turn 17 towards the end of the school year, which means that they will both have come of age and will probably obtain their apperation licenses. (Harry doesn't get to be 17 until the very beginning of book 7).
I think that it's obvious that Ron and Hermione are going to get togehter, but I don't know who Harry will get together with yet (and JKR has hinted that he will date again now that the Cho disaster has passed). A lot of people think that he and Ginny will go out, something that I would hate if that happened. Others think that he'll go out with Luna (gag. I like Luna, but not the idea of her and Harry going out). Ever since the third book, I've wanted Harry to go out with Lavender Brown. I think that she likes him, even though he hasn't really showed any signs of liking her. I think that it's also plainly obvious that Draco and Pansy (GAG!) are an item.
I think that we'll be seeing at least one more priori-incantatem before the series ends, but I think that won't be until book 7.
Rita Skeeter's year long writing ban ended at the very end of OOTP, so we'll get to see what she turns out next, and if she will continue to ruin reputations or not. It'll also be interesting to see Hermione's reaction to the end of the ban and her agreement with Rita. And speaking of Hermione, I have a feeling that S.P.E.W. will somehow come back into play, but I'm not sure if it will be in a good way or a bad way right now, because it really could go either way at this point!
Okay, during the battle in the Department of Mysteries, Ron was attacked by a swarm of brains, which left scars on him. Whose brains where they? I think that they may be the brains of dead unspeakables, possibly kept around to keep their ideas and thoughts alive. It will be interesting to see what effect this attack will have on Ron. Will he have extra memories or thoughts that don't belong to him? It'll also be interesting to see the effects of the attack on Hermione, and if she'll be "different" or not.
Okay, so Umbridge is gone from Hogwarts now (I can't believe that she wasn't killed in the cenataur (sp?) attack!). So, we will have a new DADA teacher to look forward too (of course!) and we will have to wait and see what will become of the D.A. My feeling is that it will become a school wide club.
Okay, now we come to Grawp. JKR has said that he will be more controlable in HBP. Perhaps he'll also learn a bit more English by then too. I think that he may be the key to getting at least some of the giants on the good side. I have a feeling that the entire giant population is going to be torn between good and evil, not moving to either one side or the other as a whole.
And finally, the dementors, which I most definately think will move to Voldemort's side. I don't think it will be too long before there is a major break out at Azkaban in which all of the caught death eaters from the DOM in book 5 will be free again, along with everybody else in the wizarding prison. I can't wait for Harry to meet up with Lucius Malfoy again! I also really hope that Neville will get the honors of killing off the escaped death eater Bellatrix, or giving her a fate worse than death! Sweet, sweet revenge for what she did to his parents. I know that some people will disagree and say that Harry should get to do it (because of a certain thing that she did to somebody in book 5, won't say what though so that I won't spoil it for people who haven't read it yet) but I really think that Neville deserves to be able to do that so much more.
Okay, this was a long post. Sorry.