I wouldn't expect it for a while. JK Rowling still hasn't even confirmed that she's writing this. I do know that she said something along the lines that if she writes it, she's not going to rush it because there's no point in doing it unless its amazing.
So, that in mind, I wouldn't expect the HP encyclopedia for a while.
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.
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.
I think that is the title of the encyclopedia J.K.Rowling is writing about Harry Potter.
a detective novel and a harry Potter encyclopedia
Harry potter and the deathly hallows come out in March
Harry Potter came out before Percy Jackson.
Unfortunately, no. She may write another sort of encyclopedia about Hogwarts, but sadly, Harry Potter is finished (for now).
Harry Potter and the Order of the Phoenix's book, video games, and movie have already come out.
Harry Potter is a worldwide release.
The last Harry Potter movie will come out in 2011
Harry Potter and the Order of the Phoenix (5)
There are only seven Harry Potter books and the author has said that there will be no more Harry Potter books.