The two new bosses are Dullahan and Behemoth. Dullahan is a masochistic former knight who, according to his character art, lost his head along with his mind. Behemoth is a giant chicken that makes Battleblock Theater and – oh, not that Behemoth. Sorry. Soul Sacrifice's Behemoth is an obese boy with a particular penchant for apples, which is fitting for the branches of fruit growing out of his bulbous back.
The update also adds Berserker as a new Black Rite, support for posting to Facebook and Twitter, and the Discovery Pact AR mini-game. Check out the full details on the European PlayStation Blog.