It's and MMO RTS with grand scale features and a world map, coupled with battles to take control of a territory and some kind of market place where you can buy and sell the ressources you produce on the zones you control on the planet.
You are part of one out of three corporations and you can climb the corporate ladder as well as battle the guys from the other corps until you have removed every ressource on the planet.
There's a demo available here with available online multiplayer : www.winthatwar.com
Let me know what you guys think