I recently checked out the demo after hearing it being praised pretty heavily while I was at PAX, and I've got to say.. It's well deserved.
It's an RTS game set around 1989 where you, at least in the demo, control US troops against a Soviet invasion. This is quite possibly the first RTS game I've played where I was really feeling pressured while responding to the AI. (I did skip CoH so I can't directly compare it to that game, as I'm kinda done with WWII games for now.)
http://www.worldinconflict.com/ Download available from this link -- Highly recommend checking it out.