There are just 46 days until previews of Harry Potter and the Cursed Child begin in London -- but who's counting? OK, stupid question. We're counting. You're counting. Even the official Cursed Child website is counting.

With rehearsals in session for the Harry Potter sequel, J.K. Rowling visited the Palace Theatre London to see her magical, top-secret come to life. (All we know at this point is that Cursed Child picks up 19 years after the Battle of Hogwarts and follows Harry's angst-ridden son Albus Severus Potter.)

In a behind-the-scenes video taken during the April 18 rehearsal, the cast -- including Harry (Jamie Parker), Hermione (Noma Dumezweni), and Ron (Paul Thornley)! -- rehearse their dueling and wand choreography.

In a conversation with director John Tiffany and writer John Thorne, the bestselling author said: "This will be such an incredible theatrical experience that I'd love us to be able to surprise people and move people in the natural way that a story should surprise and move people." Watch the full video below.