We all know by now that Rowling never writes anything without it having some meaning to it. I think she sometimes laughs as she's writing the books because she seems to be giving us clues as to what the future books hold and we just dont seem to know it. That said here are a few ideas about the next book that ive been having.
1. Harry's eyes keep getting mentioned often in all of the books as though rowlings is trying to tell us something. I think that for whatever reason his eyes will be a key weapon against voldemort. Or at least be very important in the next book. they just get so much attention is would be a dissapointment if they didnt have an important meaning behind them.
2. Petunia is revealed to be more than what she seems to be. The slip up of petunia revealing that she knows some stuff about the world of wizards to me says she isnt quite as mean as she comes off. Like mrs. Figg I think she's been simply assigned the task of watching harry over the years. I mean what better place to hide him than with muggles?
I think if that isnt precisley the case then instead it might be more like she has wizard powers and received an invitation to attend hogwarts long ago but refused because she was scared or something but she's had to pay for it by watching over harry instead all these years. Anyway what i'm trying to say is that I think she will in the end play a fairly significant role.
3. As a sort of tie-in with the last point I think that Petunia and the rest of the dursleys will be forced to go into the wizard world when Petunia is summoned by dumbledore to fulfill a promise, obviously hinted at by the howler. Going into the wizard world, will I think cause the dursleys to stop hating harry and just accept him instead of fighting him.
4. Ron and Hermione finally just get it over with. As much as I like tension I dont think I could wait to see this to get done in book 7. Why cant they just kiss and date and then get at each others throats because obviously they are exact opposites and break up. That way hermione for the first time in her life can actually pay attention to the way harry has always been there for her etc. etc. . . . you know the rest
5. Harry infiltrates the ministry of magic using his cloak and some excellent stealth spells, and finally finds what are behind some of those other doors. And in doing so finds some sort of cubby hole in some long forgotten room filled with dust and cobwebs that inside it has a few items or one that looks unimpressive but has more to it than he knows or anyone else for that matter.
6. Neville Longbottom finally get his due. he's been a consistent character in all the books and in OoTP showed great talent and skill in dumbledores army training. It almost foreshadows the obvious which is that in the next book he gets some real backbone and teaches malfoy a lesson. I think youll finally see the last of neville the coward and more of neville the confident hero. I think his role will be alot bigger in the next several books than people imagine.
7. Dumbledores army will be called upon in the end. Like the order of the phoenix I think his army of students will prove invaluable in the last and final book and maybe even in the 6th too. They did show some spirit in phoenix in the final chapters, and I think it will only get stronger and better.
Ok sorry I wrote so much but hey give me some thoughts about what you think about . . . my thoughts and any of your own.