There’s a write up of IGN’s spin with Chaos Rising over at the UK IGN site.
Whereas Dawn of War II allowed players to develop characters from level one to level twenty, Chaos Rising will up the level cap to level thirty providing new items, characters and abilities while adding the newest chapter in the Blood Ravens saga. Players that have their customized soldiers will be able to bring their stats and abilities that they chose forward into the expansion pack if they don’t choose to re-spec their warriors, taking advantage of larger redesigned skill trees. However, all gear acquired from the first game has been lost, forcing your soldiers to reacquire new equipment in the field and as rewards for their missions. For example, Thaddeus had a new lightning claw that provided significant melee damage, and players could pickup meltaguns to destroy vehicles. Fortunately, the number of items that you can acquire in missions has also grown, and players will discover that the supplies your troops acquire are now unique to particular units as well, being assigned instantly to those squads when you pick them up.
They outline a lot of the details of how the influence of Chaos will affect your characters as well. Be warned, there’s quite a few spoilers in this article.