We haven't heard a whole lot about the upcoming story DLC for Dishonored, but a newly updated list of PlayStation 3 Trophies for the game offers some details (via PS3Trophies.org). Bethesda Softworks and Arkane Studios haven't confirmed anything beyond the initial announcement, which spoke of a Daud-focused pack called "The Whalers," pegged for a spring 2013 release.
The updated PS3 Trophy list offers up a different name for what is presumably the first of the two planned story-expanded DLC releases: "The Other Side of the Coin." No spoilers here, but it seems that the DLC will offer two or three story missions, and it will bring back the main game's High/Low Chaos scenarios. The Trophy list offers up a few other details, though nothing that suggests this is (or isn't) the Daud-focused DLC that was previously teased under a new name.