Try as we might, we cannot get away from pre-order bonuses. Sometimes they include additional content for the very game you're ordering and sometimes, it adds a little something special to a completely different title.
The mask (a variation of which appears above) is yet another of Team Fortress 2's wardrobe accessories inspired by other titles. Previously released items inspired by other games include weapons inspired by Rift and multiple goodies from Total War: Shogun 2.
From Dust is currently available on the Xbox Live Arcade and is scheduled to land on PC at multiple digital distributors on August 17 for $15. A PlayStation Network version of the game is planned, but has yet to be dated.