Hook was one of Legacy's code names tied to something which in the end didn't transpire.
I'd be glad if there was never any Potter theming at the event. Don't get me wrong, I love HP but at which point does HHN then get watered down to align with the family-friendly Harry Potter brand and vision. We are already losing Dragon Challenge for something more suited to the whole family. Next thing we know it'll be Harry's not-even-slightly-frightening Hogwarts Halloween Party.