Well, kinda: That long-awaitingHPencyclopedia is finally, for-realsies in the works. As the author writes on her new website:
For a long time I have been promising an encyclopedia of Harry’s world, and I have started work on this now. Some of it forms the new content in Pottermore. It is likely to be a time-consuming job, but when finished I shall donate all royalties to charity.