Mark of the Ninja DLC drops on August 16
Klei Entertainment released the stealth side-scroller last year to positive reviews. It's since moved on to developing survival game Don't Starve and the upcoming Incognita, but it hasn't forgotten about Mark of the Ninja.
The downloadable content in the Special Edition features a prequel level, new costume, a different style of play with a nonlethal takedown move, two extra items, and developer commentary. It costs $5.
Source: Rock Paper Shotgun