Not much. I've checked the HPsites I know and its still a secret. I could only find that its for adults.(well it doesn't really matter. we'll read it anyways!)I found in the Leaky Cauldron that JK's 说 it was as interesting to write as the HPseries and that she learned a lot from 写作 HP so it has helped her a lot for the book.But it's not really "related" to the Harry Potter series. I would have LOVED her to write about Albus Severus,still I'm glad that she has written something. Hope its good!