Murphy confirmed the theme for the eighth season of his Emmy-winning anthology series American Horror Story in a tweet this afternoon. He started out the message with a little tease (he knows how to build anticipation), before getting right to new news: "The Coven/Murder House AHS crossover season won't be happening next year..." he teased, adding. "because it's happening THIS YEAR. AHS #8 WITCHES RULE THIS SEPTEMBER."