But it's not what you think. It will be more of an encyclopedia to add to her two other reference books that exist for the series. I didn't even know that 'Quidditch Through The Ages' and 'Fantastic Beasts And Where To Find Them' existed!

"I might do an eighth book for charity - a kind of encyclopedia of the world, so that I could use all the extra material that's not in the books."

Oh well... all good things have to come to an end. :(