A Map Editor's coming your way in Dawn of War II's next major update. For real. It's called the "World Builder", and here you'll be able to "create, edit, and play" on your own built wonderland.
You'll have terrain, objects, nodes, weather, sackboys... Okay, no you're not getting sackboys. But everything else, yeah. You can get your hands on this along with a demo map, and documentation to help you get started on the building blocks of your new world.
Oh, but it's gonna cost you, of course. No word yet on the price, but we'll be sure to keep you updated on that.