New downloadable content for anyone still playing Halo Wars is now available. Known as the Strategic Options pack, this will add-on three new multiplayer game modes.

Content: Halo Wars Strategic Options Add-on Pack
Price: 800 Microsoft Points
Availability: All Xbox LIVE regions
Dash Text: [ESRB: T (Teen) MILD BLOOD,MILD LANGUAGE,VIOLENCE] Experience Halo Wars in a whole new way with the Strategic Options Game Add-on. Three new game modes will require players to re-think their entire strategy and approach to the game. The modes include: Keepaway – capture the flag style game; Tug of War – who can field and maintain the strongest army; and Reinforcements – adapt your tactics as you are granted waves of troops.

Source [Major Nelson]