Ari Aster is still a few years from 40, yet he’s already a major auteur. He has two sui generis horror hits on his CV; a semi-pricey underperformer that has future cult item written all over it; and a superfan in no less than Martin Scorsese. He can do whatever he wants, with whatever cast he wants. So it’s not surprise that his next film, which beings production this week, is a) part of a semi-uncool genre, and b) has quite the cast.