Also, immediately after the Slytherin puddle conversation, Rosa told me, "You know there's going to be a new Harry Potter movie _Fantastic Beasts and Where to Find Them_?"

Appears to even be true: there are many articles in many legitimate news sources (for example here's an Entertainment Weekly post on the movie plans, as opposed to the big sad I had a few days ago when an April Fools post about an 8th HP book was recirculated and I was taken in.