I debated over this one but in the end couldn't resist it. I'm in the middle of a reread of the entire series right now and will read this one after that. Description from Amazon:

"The Eighth Story. Nineteen Years Later.

Based on an original new story by J.K. Rowling, Jack Thorne and John Tiffany, a new play by Jack Thorne, Harry Potter and the Cursed Child is the eighth story in the Harry Potter series and the first official Harry Potter story to be presented on stage. The play will receive its world premiere in London’s West End on July 30, 2016.

It was always difficult being Harry Potter and it isn’t much easier now that he is an overworked employee of the Ministry of Magic, a husband and father of three school-age children.

While Harry grapples with a past that refuses to stay where it belongs, his youngest son Albus must struggle with the weight of a family legacy he never wanted. As past and present fuse ominously, both father and son learn the uncomfortable truth: sometimes, darkness comes from unexpected places."

Finally got around to reading this one. It is very different, being a play rather than a novel, so that's one "problem" with it. Far less detail and less insight into the thoughts of the characters. Another problem is that some of the magic seems easier in this play than in the books. Polyjuice potion, for example, is apparently either readily available at all times or is suddenly far less time-consuming to make. It took a month or more to make it in the Chamber of Secrets, but in this one, everyone seems to have it and Albus even volunteers to make some on the spot. That's my biggest complaint about the book, the seeming lack of continuity with the others in the series.

It is a decent story and I'd love to see Rowling turn it into a novel instead of a play. I think Albus and Scorpius have potential as characters, and it is interesting to see Harry, Ron, Hermione, and Draco as adults. So it was worth the read.