Advance Wars: Days of Ruin impressions at Nintendo World Report.

"Days of Ruin (DoR) is an apt name for the next installment in the Advance wars series. The colorful battlefields and cheerful commanding officers (COs) have given way to a far darker scenario. The setting in DoR is post-apocalyptic. A meteor storm has laid the world to waste causing the surviving people to band together into groups to compete for scarce resources. The maps have taken on a slightly more realistic tone, and the CO and battle artwork has taken on a gritty hand-drawn style with thick lines, but the in-game units retain their saturated monochrome look so that players can easily distinguish units from terrain and from one another."

Full Source: Nintendo World Report