From Mugglenet
Random facts about the book
The sixth book is yet to be titled, and don't believe anything otherwise.
By the ends of books 6 and 7 "you'll have all the back story you'll need", says JK Rowling, and a prequel will not be necessary
There will be a new Minister of Magic, no more Mr. Fudge.
We will find out what happened to Hagrid's half brother Grawp. He will be a bit more controllable in book 6.
The Dursleys are in the next book, but Harry's stay with them will be the shortest yet. In book 5 he stayed for 4 weeks, so we know his stay will be less than 4 weeks.
Cho Chang will not be a romantic interest of Harry in Book 6, however there will be a "little romance" for Harry says JK.
In books 6 and 7 we will find out exactly why JK killed off Sirius.
Harry becomes even more powerful in book 6.
In books 6 and 7 we will find out why Dumbledore trusts Snape.
We will find out what happened to Wormtail AKA Peter Pettigrew
More about the animosity between Snape and Sirius will be revealed in the last 2 books.
JK has said that giving away the form of Snape's boggart and patronus says too much. We'll definitely find out what Snape's worst fear is, and it'll be important.
Hermione and Draco will NOT end up together in book 6 or 7.
We will find out what exactly Dudley saw when he looked at the dementors.
The reason Voldemort and Harry both didn't die when Voldemort tried to kill Harry, will be revealed.
We will see more of Draco's mother, Narcissa Malfoy, now that Lucius is busy.
We'll learn more about Harry's scar in the last 2 books.
Moaning Myrtle will make an appearance again, as will Tonks.
More about Voldemort's birth will be revealed, thus helping us understand why he is so evil.
Muggles begin to notice "more and more odd" occurrences in book 6, says JK.
The wizarding world is really at war in the sixth book.
Harry will tell his dearest friends about the prophesy after it sinks in to him.
We will learn more about Harry's relatives, including his grandparents (though JK says they aren't really important to the story)
We will find out what happened to Sirius's motorbike.
Book 6 will be shorter than the 5th book (or at least JK's 99% sure, but will not swear on her children's lives)
There will be no "new" nationalities of children at Hogwarts. Hogwarts is a British school, and JK says that adding foreigners for the sake of it is not in her plans.
During an interview, when JKR was asked in which Hogwarts room she'd like to be for 1 hour, she said it would be a room in which Harry has been before, but doesn't know its importance. Yet. (this could have happened in book 5, but we're unsure)
The room of requirement anyone?
It's very important in the plot that Harry has his mother's eyes, and that her wand was very good for charms.
Order of the Phoenix UK/Bloomsbury edition page 39
Harry is in the kitchen after he and Dudley face Dementors in Little Whinging - Harry explains that Lord Voldermort is back - they know Voldermort as it must have been explained in the letter Dumbledore left the night he left Harry with the Dursleys
"Back? Whispered Aunt Petunia.
She was looking at Harry as she had never looked at him before, and all of a sudden for the vety first time in his life, Harry fully appreciated that Aunt Petunia was his mother's sister. He coule not have said why this hit him so very powerfully at this moment. All he knew was that he was not the only person in the room who had an inkling of what Lord Voldermort being back might mean. Aunt Petunia had never in her life looked at him like that before. Her large, pale, eyes (so unlike her sister's) were not narrowed in dislike or anger, they were wide and fearful. The furious pretence that Aunt Petunia had maintained all Harr's life - that there was no magic and no world other than the world she inhabited with Uncle Vernon - seemed to have fallen away"
I think that paragraph is of great importance Petunia has a LOT of secrets up her sleeve/
During an interview for Kids BBC, Victor Greensteet (reporter) asked Rowling if Harry would have a dragon for a pet. This is what she replied: "You can't tame a dragon, no matter what Hagrid thinks. It's simply impossible. So no. He has more common sense. He MAY have a different pet in the future, but for now, I won't say anything else". (This could have been buckbeak, but I'm sure we can expect more pets)
In the same interview for Kids BBC, the reporter asked J. K. if Harry had ever used the internet, and this is what she had to say: "No. They (the Dursleys) won't let him go near Dudley's computer, and Dudley is the only one who has a computer. They hit him if he gets too near to the keyboard. So the answer would be No. I use it a lot, but Harry doesn't. Wizards don't really need to go on the web. They have an even better way to find out what's happening in the outside world, which I think is a lot more fun than the Internet, but I'm going to keep quiet on this one."
The choice between what's right and what's easy will be a pillar of the plot in Harry's last 2 years at Hogwarts
Harry's parents' profession will be a big part of the plot.
Something HUGE will be revealed about Lily Potter.
Ooh I can't wait - I wonder what???
This is interesting
"Why did voldemort pick harry and not neville
JK Rowling replies -> Dumbledore explains this in 'Order of the Phoenix'. Voldemort identified more with the half-blood boy and therefore decided he must be the greater risk. "
So JK counts Harry as half blood! Makes sense his mother was Muggley
as is this:
Siriusstar: Is Remus a pureblood?
JK Rowling replies -> Half blood.
but he's not in chamber so it's probably not him