You'll have to check it out yourselves, but here are a few teasers.
JK dismisses rumours that Voldemort is Harry's dad.
She reckons readers have "been watching too much Star Wars", adding: "James is definitely Harry's father."
Claims that Crookshanks is an animagus are also kicked out, but JK reveals: "He's not pure cat either."
Other fascinating info on the site includes JK saying that the first chapter of book six nearly made it into book one, and book three and book five. Phew!
You can also check out JK's life story (with family pix) and find out random facts about Hermione, Crookshanks and the Weasleys among other characters.