Today, Rockstar Games and Spike TV announced that “Grand Theft Auto IV: The Lost and Damned” will world premiere at the 2008 Video Game Awards, live Sunday December 14 at 9:00pm, ET (tape delay on West Coast).
Available exclusively on Xbox LIVE worldwide on February 17, 2009, “Grand Theft Auto IV: The Lost and Damned “requires players to have the full version of “Grand Theft Auto IV” for Xbox 360 and Xbox LIVE membership to download.
Source: Spike TV
According to a product listing by Gamestop the DLC will cost $19.99 USD.