USA Today has published an article revealing information on the upcoming GTA IV downloadable content. The content will be released to the Xbox Marketplace on February 17, 2009. The episode, titled “The Lost and Damned” will revolve around Johnny Klebitz, a member of the Liberty City biker gang The Lost, who you meet a couple times in GTA IV’s singleplayer game (Elizabeta has you overlook a drug deal with him, and Ray has him accompany you on the diamond deal).
Houser had this to add about the DLC’s features and story:
The story is not directly impacted by decisions you took in the main game but tons of details and mysteries from the main story get explained, so it will add a lot of color to the main story. We feel like we’ve only scratched the surface in terms of the depth and detail in GTA IV’s mythical Liberty City.