Harry Potter and the Deathly Hallows

Harry Potter and the Deathly Hallows is the last book in the series.

Known information
J. K. Rowling has given very little information on this subject. However, she has stated the following:


 * Harry might get another pet at some point. She also hinted that Fawkes, Dumbledore's phoenix, might have another role. However, Kreacher may have filled this role.


 * Rowling wrote the last chapter of the book some time ago, to give her an ending to work up to. The last word of the seventh book, according to Rowling, is currently "scar".


 * Rowling has stated that there will be no Quidditch matches in book seven.[18]


 * We will learn something very important about Lily in book seven.
 * Rowling has long said that Harry's eyes resembling his mother's is important.


 * Severus Snape's loyalty will be settled in the final confrontation of the book.]


 * She has stated we will learn more about Peter Pettigrew.


 * We will also learn about Dumbledore, and his family.
 * She refused to comment when asked whether the locked door in the Department of Mysteries in the Ministry of Magic would feature in the final book.


 * Rowling mentioned that something more would be revealed about Petunia Dursley.
 * Rowling has said that some non-magical character will perform magic late in life in desperate circumstances. However, it will not be Aunt Petunia.


 * Rita Skeeter will return.


 * Dolores Umbridge will return


 * Viktor Krum is set for a reappearance.
 * We will discover what was Dudley Dursley's worst memory when he stood in front of the Dementors.


 * Sirius' two-way mirror and his flying motorbike will return.


 * Rowling refused to comment whether Sirius himself might in some way reappear, but she has also said that there was a reason why he had to die.


 * Dumbledore was seen to have a "gleam of triumph" in his eyes when told that Voldemort had restored his body using Harry's blood, at the end of Goblet of Fire (Ch. 36). Rowling has confirmed that this is "still enormously significant".
 * Someone from Harry's class, not Harry, Ron, or Hermione, also not who most readers would expect, will become a Hogwarts teacher. This seems to indicate that Hogwarts will indeed re-open, though possibly not until after the main events of book seven have occurred.


 * Rowling has stated that there will be a member of the Order of the Phoenix who has been seen very little so far who will be important in the seventh book. This could possibly be Albus's brother Aberforth Dumbledore.


 * We will find out why did Dumbledore had James' invisibility cloak at the time of James' death, given that Dumbledore could make himself invisible without a cloak?


 * Rowling has promised fans that they'll, "See [stuff] again" from Ginny in book seven, implying that at some point, whether Harry likes it or not, she will become involved in the fight against Voldemort.