-The book might be called "Harry Potter and the Forest of Shadows".
-Harry Potter might die.
-Lupin returns to play a bigger role than his role in Book 5.
-During an online chat at Scholastic, JKR was asked: "What makes some witches/wizards become ghosts after they die and some not?" She replied: "You don't really find that out until Book VII, but I can say that the happiest people do not become ghosts. As you might guess Moaning Myrtle!"
-Proffesor Snape might fall in love and Proffesor Trelawney might fall in love with Snape. But, Snape will not neccesarily fall in love with Trelawney.
-Harry might fall for a teacher.
-The last word of this book will be scar. It is a proven fact from Time Magazine.
-JK Rowling has said the last word of the last book will be scar! Now she says that it may change during the writing of Book 7.
-Lupin will make a return. J.K.R said she is pretty sure she will put him in the 5th book, but she definetly said he is goniong to play a big role in the 7th book.
-One of the classmates will become a teacher at Hogwarts - Neville Longbottom.
-A big revelation is made about Lily Potter.
-Hermione will be made a Head Girl.
-When Harry spared Peter Petigrew's life he created a special bond according to Dumbldore. Since Voldmort was ressurected of Pettigew's arm, it may have some kind of effect like when the one when Lily Potter sacraficed herself for Harry. Also, Voldmort has Harry's blood in him which could also cause something.
-"The Sorting Hat is more ijmportant than it seems in the first three books" - J.K. Rowling
-Ron's birthday is the 1st of March.
-Hermione's birthday is September 19th.
-"There is a charecter who manages to do magic very late in life, but this is very rare in the world I am writing about" - J.K. Rowling
-Snape might die in a future book because Voldemort said that 6 Death Eaters were missing and 1, who had left him forever, will "be killed". It could not be Kastrof because Voldermort said that one had run away and Kastrof ran away that night.
-Wormtail might help Harry later. From the third book "This is magic at its deepest, its most impenetrable, Harry. But trust me... the time may come when you will be very glad you saved Pettigrew's life."
-Ron Weasley may have come from the legend of Running Weasel. He was very good at chess and was killed by a yellow rat. Ron is very good at chess and had a rat whom he tried to turn yellow in Book 1.
-The Order of the Phoenix might not have to do with a gang of wizards fighting the dark side, though that possibility is not ruled out. It migh have something to do with an ancient legend about two wizards sharing the same pheonix wand core, just like Harry and Voldemort do. Also, Fawkes might not be Dumbledore's pet by coincidence.
-A theory about Lily Potter:. She has red hair, she is from a muggle family. Ron said in the first book, on the train ride to Hogwarts, that his mom has a second cousin who's a muggle accountant. All the weasley's have red hair. Their is a possibility that Lily might be related to the Weasley's.
-Professor Trelawney's first prediction was very important.
-Crookshanks will be back in the future books and he will probally play an important role.
-Where Harry lives during the summer, the Dursleys, will play an important part of a plot in one of the future books.
-Aragog will appear in uture books.
-We all realize that Harry's father James was in slytherein right? "All wizards which went bad were in slytherein." If this is true than Sirius Black was in Slytherein. The above quote was taken from someone who did not know the Sirius was not really a dark wizard so therefore Sirius must have been in Slytherein. Sirius Black was in Slytherein. Black is James Potter's best friend. I would expect that the best friends which were always together were in the same house. It seems that way. If they were always together they would pretty much have to be in the same classes. In order to be in the same classes they must be in the same house. Therefore, if Black was in Slytherein so must have James. James Potter was in Slytherein. Therefore Harry can't be related to Gryffindor because his mom was muggle born. I should hope that if his father had Gryffindor blood, he would be in Gryffindor. Following this theroy, Lupin and Pettigrew would have been in Slytherein. Pettigrew is definately a Slytherein, adding more proof.
-JKR announced in an online chat that Harry and Draco do not team up in a future book, as was previously rumored.
-Mr. Weasley's flying car will reappear.
-JKR revealed an interesting pice of information during an online chat at Newsround: "Q: Have any of the Hogwarts professors had spouses? A: Good question - yes, a few of them, but that information is sort of restricted - you'll find out why."
Harry cannot have a pet dragon, said JKR in a 2000 chat: "You can't domesticate a dragon whatever Hagrid thinks. That's simply impossible. So no. He's got more sense. He might get a different pet at some point but I'm saying no more at this moment."
No characters named Icicle are planned -- JKR actually said that she has no idea where we come up with stuff like this, though she specifically said Icicle would be a name used in a future book before.
-JK Rowling says, "Magic can't bring dead people back to life," so we will not see a "live" Lily or James Potter.
-"There is more to the Sorting Hat than what you have read about in the first three books," said Rowling. "Readers will find out what the Sorting Hat becomes as they get into future books."
-How is it determined who gets a letter from Hogwarts? JK Rowling says:"In Hogwarts there's a magical quill which detects the birth of a magical child, and writes his or her name down in a large parchment book. Every year Professor McGonigal checks the book, and sends owls to the people who are turning eleven."
-On 60 Minutes, we learned the Ravenclaw Ghost is The Gray Lady. Will we see her in a book soon? Actually, JKR says we already come into contact with her in Book 1.
-Said J.K Rowling, "There is a character who does manage in desperate circumstances to do magic quite late in life, but that is very rare in the world I am writing about."
-We will see a return of Mr. Weasley's flying car, Aragog the spider, Sirius Black, Dobby and Crookshanks.! We probably will not see Lockhart.
-JK Rowling says Hermione will lighten up even more in future books.
-We will learn about Harry's grandparents in future books.
-J.K Rowling said in several interviews that Harry will not become an animagus like his father.
-The secret to Harry's riches will be revealed in an upcoming book.
-A reporter who interviewed Ms. Rowling said JKR confided Harry will NOT be tempted to the Dark Side.
-Lupin might die because Peter has a silver arm and silver kills werewolves.
-Harry might become Gryffindor's heir. Proof: 1) his birthday is on July 31, wich falls under the astrological sign of Leo, the lion. The lion is the house symbol for Gryffindor. 2) He was able to summon the sword of Grodric, which only a "true Gryffindor could do". 3) It was predicted that the heir to Gryffindor would bring down the heir to Slytherin, which explaines why Voldemort wanted to kill him and his father. 4) The sparks that harry shot out of his wand were the house colors for Gryffindor.
-There is major reason to believe that Crookshanks is Ms. Figg becaus she found her way to Potter in order to protect him, both when he was in Hogwarts and when he was home with the Dursely's. There has been spectulation for awhile that Crookshanks is in fact an Animagus. Crookshanks might also be half-kneazle, as defined in the Magical Creatures book.
-JK Rowling said that the next books will be "Darker". She also said another person who dies will be a "special fan" of Harry's. Colin Creevy, a huge fan of Harry, might be the person who dies. But, it may also Ginny Weasley or Dobby.
-Info from an editor predicts that Harry is going to be expelled. When is not known, but Harry is going to find another school and will get back in Hogwarts after stoping something.
-Lupin might come back as the Defense Against the Dark Arts teacher and Fleur Delacour will work as a teacher's assistant. Victor Krum might come back as a first year flying teacher and Quidditch refree. Karkoff might come back and work with Dumbledore. Siruis might stay at Hagrid's hut for the year.
-Harry will not be attacked as much in one book but there will be a assault on the entire school and Harry might be framed.
-We will learn what Harry's parents did for a living before they were killed by Voldermort. JKR says this is intregal to the plot.
-The fact that Harry has his mother's eyes will be very important in a future book. As is the fact that her wand was a great wand for charm work.
-We will see an heir to Voldemort.
(from different sources)