Bethesda and Arkane Studios has a final DLC for Dishonored coming in August: The Brigmore Witches. It will launch August 13th for $10 on PS3, XBox and PC.
The Brigmore Witches will be Dishonored's second story based expansion and will conclude the story of the assassin Daud. He was only an NPC in the main game, but was featured in the previous story-based add-on, The Knife of Dunwall. If you have a save file from that prior DLC, your progress (power, weapon, item upgrades, etc) will carry over to The Brigmore Witches.
Inititally, I thought perhaps this was only the final add-on to focus on Daud, but according to Bethesda it is "Dishonored's last add-on."
The story itself, if you don't mind spoilers, starts after Daud tracked down Delilah, the head of the Brigmore Witch coven, in The Knife of Dunwall. It will be up to him to stop her from carrying out an arcane ritual that will end his existence. He'll have to work with new gangs as he travels through the districts of Dunwall and in the end, Daud will answer for his crimes, including the murder of the Empress from the original game, at the hands of Corvo Attano.
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