if the video card isn't upgradeable, there isn't anything you can do right now. there's some talk about the asus XG (external gaming card) but.. that isn't out, and even when it come out, it's gonna cost you a few hundred bucks. also, i think the way it's been presented, you'd have to carry another "brick" (and quite a large one, based on my understanding) with your laptop.
IMHO, you should return the laptop and buy a laptop with sufficient graphics performance.