Chaos Rising is an astral continuation of Relic's Dawn of War series of real-time policy titles, contribution to an incredible amount of mission variety as well as some valuable new abilities and unit that are sure to please Warhammer 40k diehard.
Most of the time strategy expansion follows a characteristic formula: they add at least one new group, some new units, a handful of new maps and maybe some extra single-player content. While Chaos Rising, the new growth for Relic's amazing Dawn of War II, follows this formula closely, it's the depth and quality of the new movement, units, and maps that sets it apart from most expansion.
Dawn of War II players have been treating to a throng of free updates that have added new modes like Last Stand, and THQ has wisely decided to make most of the multiplayer happy found in Chaos Rising available to every Dawn of War II owner through a patch. That means whether you buy the growth or not, you'll have access to new units and maps. It might sound like a foolish business decision -- why buy the spaceship when you can get the stardrive for free you get access to Chaos Rising's new single-player experience as well as the Chaos Space Marine group in online multiplayer.