L.A. Noire's mysterious Rockstar Pass is available now from the Xbox Live Marketplace, priced 800 Points.
Microsoft's listing has finally detailed the download's contents - including a forthcoming unrevealed DLC pack, "Reefer Madness".
The pass immediately grants access to the game's various pre-order items, the first announced DLC pack "Nicholson Electroplating" upon its 21st June release and another add-on, "Reefer Madness".
Rockstar split pre-order content five ways - extra costumes The Broderick Detective Suit, The Sharpshooter Detective Suit and The Badge Pursuit Challenge & Button Man Suit, the latter of which adds an additional collection quest to the title.
There's also "The Naked City" Vice Case and "A Slip Of The Tongue" Traffic Case, which each add 100 Achievement Points.
June's "Nicholson Electroplating" is an Arson Case, while "Reefer Madness" is a Vice Case. Rockstar Pass owners will able to redeem both free upon their release.
The game's extra cases are set during the existing game's storyline, and can be accessed via the game's "Cases" menu.