Other questions J.K. answered at the tour:

-Did Neville find love?
He married the landlady of the Leaky Cauldron, Hannah Abbot.
-Why did she choose Molly to kill Bellatrix?
She wanted to show that Molly was a really talented witch even though she spent most of her time in the kitchen. She also wanted to compare Bellatrix's obsession with Voldemort to Molly's maternal love to her children.
-What would of happened if Arthur Weasley had died in the fifth book?
It would have change the fifth, sixth, and seventh book, Ron would have lost his sense of humor and it would have taken away Harry's refuge at the Burrow. Ron's humor stemmed from insecurities and immaturieties and he was the last two become an adult, facing his fear in the 7th book.
-What's up with Aberforths obsession with goats?
They were easy to clean and had curly horns.
-How did Ron speak Parseltongue?
She said that he had mastered one sound not the whole language.
-What was in Dumbledore's letter to the Dursley's in book 1?
Petunia had wanted to got to Hogwarts and by taking in Harry she was taking in a part of the world she could never particapate in.
Well that's all the questions guys! Hope you enjoyed XOXO