Even before Left 4 Dead 2 hits stores and Steam, players of the recently released demo have discovered what appears to be the title of upcoming DLC packs for the cooperative, zombie survival FPS.

By digging around in the demo's code, several members of the Rage3D forums discovered multiplayer error messages sent to players after failing to load DLC content selected by the session's host. These messages mention the "Miracle Pack" and the "Apocalyptic Pack".

The error messages don't specifically mention a type of DLC, meaning the packs could contain anything from new maps to weapons.

Left 4 Dead 2 is scheduled for a November 20 release on PC and Xbox 360.

Via Joystiq