The civilizations you build in Populous DS can grow in different areas of the Populous world, developing wildly different cultures. Famitsu has revealed these cultures and the warriors produced by each. By far the most interesting area you can build is the Nintendo-themed land of Bitplane, in which buildings are gigantic Nintendo consoles and the inhabitants are made of pixel-like cubes. Basically, it's just like our minds, except that we assume useful work gets done within its confines.
Our other favorite new location is Mars -- not because we hate liquid water (apparently the denizens are grateful for tsunamis), but because it is protected by caped superheroes. And also because we're just going to assume that the cities are full of circa-1990 Spike Lees.