From the announcement:
Fantasy Flight Games is proud to announce Manor of Ravens, the newest expansion for Descent: Journeys in the Dark Second Edition. In this expansion, the heroes must travel to an abandoned manor house to destroy the terrifying guardian that gathers power within the house’s walls. Along the way, they will face deadly danger, and if the house itself comes awake, can any hero hope to survive? Introducing new monsters, heroes, classes, and items, alongside a new mini campaign, Manor of Ravens will lead you into entirely new adventures.