This game flew completely under my radar until just this week. IGN has a bunch of stuff on it, but start off with the Features section and read the countdown parts 1-3 which explains backstory, overview, gameplay, etc. Reading those has actually gotten me very excited about the game, and the best part is that it has already gone gold and is set to release Tuesday I think.
http://pc.ign.com/objects/682/682220.html