THQ and Relic have revealed details of some new downloadable content for Warhammer 40,000: Space Marine, with new additional missions and maps planned for the recently added Exterminatus co-op mode. The crux of the upcoming add-on will be a new Exterminatus mode called 'Chaos Unleashed', which will add new boss rounds, new co-op arenas and new enemy units.

Chaos Unleashed will see you playing as the Chaos Space Marines as you take the fight to the Imperial Guard and the Ork hordes, with the Imperials getting their hands on an Imperial Sanctioned Psyker, which is one of the new enemies you'll face. As well as the Chaos Unleashed mode, there'll also be three new multiplayer maps in the pack, called 'Habs Ablaze', 'Station Tertius' and 'Aquila Canyon', each of which will be playable across all multiplayer modes. The pack will also add ten new trophies.

Free DLC is also planned for Space Marine, with the addition of the Capture the Flag Mode for multiplayer, meaning you'll be nabbing your rival's flag while defending your own. Yep. That's Capture the Flag alright. And finally, THQ will also be releasing some player skins for Space Marine, giving players a choice of unique Salamanders, Alpha Legion, Legion of the Damned and Blood Angel skin packs to download for £2.39/$3.99 apiece.

Warhammer 40,000: Space Marine's premium DLC will be available in December for £7.99/$9.99, with the free CTF mode and player skins emerging at around the same time.

[Via SpaceMarine.com | Thanks, Paul]