A friend of mine found this buried in a Reuters article about Bloomsbury profits over the last fiscal year.

Bloomsbury, the publisher of the “Harry Potter” series by author JK Rowling, also said it was counting on a new Rowling three-book box set tied into the Potter series, and a non-fiction account of spies in World War II to support sales in the coming year.

This is the first I’ve heard of any three-book box set of new content in the Potter-verse. What this could be I have absolutely no idea, but deep down I’m hoping it’s a set of Marauders-era stories. A man can dream. Chances are, it’s something more along the lines of a collection of Potter universe lore stories (Tales of Beetle Bard) or the Potter Encyclopedia Rowling has said she’s working on.