Klei's frankly excellent stealth game, Mark of the Ninja, is getting a special edition DLC. It will add a developer's commentary to the game. Also, a new level, two new items, and a new costume.
That developer commentary is the real draw. It's not often that we have gamemakers go in-depth with explaining the composition of their work. Even rarer when they've developed one of the best games in recent years.
Klei announced that the DLC is due out on 16 August:
Mark of the Ninja: Special Edition DLC is arriving on Steam / XBLA on Aug 16! New costume, level, and TONS of developer commentary!
— klei (@klei) August 6, 2013
And released a trailer saying how great their game is:
You're allowed to release trailers like that when you game is as good as Mark of the Ninja.