There are no details about the encyclopaedia and it will take a long time to make. Pottermore seems to be her focus at the moment.
1990
There isn't an official Harry Potter encyclopedia. J.K. Rowling, the author of the Harry Potter series, has said they she may write one but it won't be for a while.
a detective novel and a harry Potter encyclopedia
No, she did not. Book 1 of the series (Harry Potter and the Philosopher's Stone) was first published by Bloomsbury Publishing.
J.K. Rowling has stated multiple times that she doesn't plan to write any more Harry Potter books. However, she has said that the Potter characters are "still living on in her head" and "in 20 years she might consider it" but the chances are pretty slim. Currently, she is working on a website called PotterMore, which is all about Harry Potter, and scheduled to open in the fall. However, she has revealed plans to eventually publish a Harry Potter Encyclopedia, full of facts about Harry's world.
J.K. Rowling confirmed that she would not be writing another Harry Potter book, but there are rumors that she is currently working on a Harry Potter encyclopedia. However she has stated that an encyclopedia will take a very long time to produce and her next book, The Casual Vacancy, is not related to Harry Potter.
Unfortunately, no. She may write another sort of encyclopedia about Hogwarts, but sadly, Harry Potter is finished (for now).
No one knows when it wil lcome out. J.K Rowling didnt even start it yet!
J.K Rowling is currently still writing, it's an encyclopedia for Harry Potter that will have everything in it, however we don't know when it's going to be out
Harry Potter was written by J. K. Rowling.
She is the Author of Harry Potter.
No. She said she's likely not going to write anything else Harry Potter related except perhaps an encyclopedia. She didn't rule it out entirely though.