Previously, Capcom had announced a Siege mode for the first DLC for Resident Evil 6, but it's absent from the upcoming extra content.

Gamespot has confirmed with Capcom that the mode – where the human side protects a non-playable NPC from the other – is still coming at a later, unspecified date.

For the December 18 DLC, Capcom has replaced Siege mode with Onslaught. The DLC will be available on that date first for Xbox 360 (no word on when the DLC comes for PS3), and each mode can be purchased separately for 320 Microsoft points or in a bundle for 720.

For more info on the DLC modes, take a look at our previous story.