THQ announces Dawn of War II: Chaos Rising, an upcoming expansion for Relic's Warhammer 40,000-inspired RTS sequel due for release in Spring 2010 for Games for Windows LIVE. There are some details and a pack shot here, and here is the announcement:

Continue the single player campaign from the original Dawn of War II with all new Wargear and a level cap raise from 20 to 30 for your Blood Raven squad. Veterans of the Dawn of War II single player campaign can use their existing squads’ accumulated wargear, abilities and experience to battle the traitorous Chaos Space Marines of the Black Legion throughout 20 new missions. Powerful new Chaos-tainted wargear can also be equipped and used against your enemy, but doing so could lead to dreadful consequences.

The Chaos Space Marines will also be playable as a brand new army in multiplayer. Other multiplayer additions include new units for Orks, Eldar, Tyranids and Space Marines, as well as new multiplayer maps.