The Bethesda Blog has word that The Brigmore Witches DLC is now available for Dishonored, saying this pack for the first-person stealth/action game is out on Steam, Sony Entertainment Network, and Xbox.com. They also have a Review Roundup showing the favorable notices this is receiving. Here's word:

We’re pleased to announce that Dishonored: The Brigmore Witches, the final add-on pack for Arkane Studios’ critically-acclaimed first-person action game, is now available worldwide via Xbox LIVE (800 Microsoft Points). The content will be available worldwide on Steam and the North America PlayStation Store later today and on the European PlayStation Store tomorrow.

In The Brigmore Witches, you continue your journey as the legendary assassin, Daud, and bring his twisted narrative that began with The Knife of Dunwall to a close. After discovering the identity and intentions of Delilah, the leader of the Brigmore Witch coven, you set out to disrupt her from completing a powerful ritual that will spell your doom. Having already been betrayed by your lieutenant, Billie Lurk, you must rely on feuding gang factions—the Dead Eels and the Hatters—to negotiate your way through previously unseen districts of Dunwall en route to Delilah’s stronghold. Regardless of the way you reach your destination, one thing is for certain – you will finally answer for your treacherous actions and fall before the mercy, or punishment, of the Royal Bodyguard and Assassin, Corvo Attano. Additionally, your power, weapon and item upgrades, Chaos level, and player actions from The Knife of Dunwall will carry over via a compatible save file option.