Additional interview summaries for Open Book Tour

Here is a list of the new canon from Rowling's visits to New York and Toronto (except for the Sweepstakes reading at Carnegie Hall, which was posted previously).

J. K. Rowling Talks Marriage, Writing and More at Open Book Tour Stop in New York City
The Leaky Cauldron

• Harry and Dudley kept in touch as adults, but the relationship remained awkward.
• Dumbledore loved Harry like a son.

PotterCast #122: It's Saturday Night [Leaky staff meet Rowling! audio only]
The Leaky Cauldron

• Helga Hufflepuff offered the house-elves refuge at Hogwarts, though conditions there were still slave-like, if a bit kinder than elsewhere.
• The Sorting Hat initially wanted to put Neville into Hufflepuff House.
• Harry was not technically a Horcrux, due to Voldemort’s lack of intent.

Toronto Press Conference [video] [transcript here]
Canadian Broadcasting Corporation

• There wasn't a point at which Rowling decided that Dumbledore was gay; she gradually realized it "very early on" while writing the first book.
  
• Rowling "probably" won't write a prequel.
• JKR: "He [Dumbledore] is my character, and as my character I have the right to say what I say about him."
• Most of the tweaking of the epilogue was to remove information; the biggest change was the addition of information about Teddy Lupin.
• Rowling still plans to write an Hogwarts encyclopedia, but not immediately.
• Hermione would read Margaret Atwood's books; Harry and Ron don't read much as adults.

Rowling knew early on Dumbledore was gay
Canadian Press via The Star

• Dobby's death was the hardest one to write.