I’ve just heard about J.K. Rowling’s The Tales of Beedle the Bard (mentioned by Rowling in the final Harry Potter book Harry Potter and the Deathly Hallows), originally published as seven handmade originals but now being released for the general public.
It’s supposed to be like Aesop’s fables but written from the world of Harry Potter. In Harry Potter and the Deathly Hallows, it was bequeathed to Hermione Granger by Albus Dumbledore. The five fairy tales in The Tales of Beedle the Bard are: The Wizard and the Hopping Pot; The Fountain of Fair Fortune; The Warlock’s Hairy Heart; Babbitty Rabbitty and her Cackling Stump; and The Tale of the Three Brothers.
And Rowling is putting out a special Collector’s Edition made to resemble a wizarding textbook found in the Hogwarts library and including a reproduction of Rowling’s handwritten introduction.
Sounds like something every Harry Potter fan should have. :)