WHAT DOES JK SAY ON ORDERS OF PHOENIX 
What will happen in "Harry Potter and the Order of the Phoenix"?
"In book 5, we go into a whole new area, physically, an area you've never seen before, a magical world"
"What's very important for me is when Dumbledore says that you have to choose between what is right and what is easy. This is the setup for the next three books. All of them are going to have to choose, because what is easy is often not right."
"You'll be seeing Mrs. [Arabella] Figg in book five, and you'll find out all about her."
Harry will see him [the real 'Mad-Eye' Moody] in book five.
Why do some wizards/witches become ghosts and others don't? "You will find out much more about that in book five."
There will be a female Defense Against The Dark Arts teacher.
"You see Lupin in Book Five. Yes you see a lot of old characters in Book Five."
Book five will be scary. Harry finds out a lot of things he hasn't stumbled across so far.
"The Dursleys are in the next book, and there's stuff coming with them that people might not expect."
"Ginny Weasley [little sister to Harry's best friend, Ron] will play more of a role in Book Five."
"In book five [Harry] has to examine exactly what death means, in even closer ways."
"Harry visits a few places that have been mentioned in the books, but we've never got inside before. He visits places other than Diagon Alley and Hogwarts."
"They're 15 now, hormones working overtime. And Harry has to ask some questions that I hope the reader will think, 'Well, why hasn't he asked this before?"
[The final chapter of book seven is] "the epilogue and I basically say what happens to everyone after they leave school, those who survive -- because there are deaths, more deaths coming."
"One of the promised deaths is going to be horrible to write"
"I'm not going to say I'll never write anything to do with the world of Hogwarts ever again. Because I have often thought that (if I wrote) book eight, I think it would be right and proper that it should be a book whose royalties go to charity entirely."It could be the encyclopedia of the world (of Hogwarts) and then I could rid myself of every last lurking details, but no not a novel."