We can tide ourselves over with the two books coming out March 2001 that she wrote for the charity Comedy Relief. (They'll be published in the USA by Scholastic, in the UK by whoever publishes her there, and the rest of the world will have to look it up.) Depending on what company your bookstore uses, the titles might be under her name, or under the pseudonyms. The books are Quidditch Through the Ages by Kennilworthy Whisp and Fantastic Beasts and Where to Find Them by Newt Scarmander.