Klei Entertainment has announced that the Special Edition downloadable content pack for Mark of the Ninja will be coming to Steam and Xbox Live Marketplace on the 16th August.
According to the developer's Twitter "Mark of the Ninja: Special Edition DLC is arriving on Steam / XBLA on Aug 16! New costume, level, and TONS of developer commentary!",
The game will also include two new items, and more options for a non-lethal approach.