J.K. Rowling has revealed her answer to the winning question about The Casual Vacancy as voted on by Goodreads members. Her answer was posted to Goodreads on July 25th.
The winning question and her answer are both at this link.
Rowling answered the winning question to this contest to promote the release of the paperback editions of the novels, which were released on July 23rd.
Read this previous article for more details (plus my own thoughts). Share your own thoughts about her answer in the comments!