Immensity also has a graphics processor onboard: ATI's mid-range Radeon HD 5770. In Asus' opinion, enthusiasts buying this board plan on building multi-GPU machines. So, why not start them off right with an integrated GPU? That way, even if you only drop in one discrete card, you'll still have two GPUs working cooperatively.
http://www.tomshardware.com/reviews/computex-sandy-bridge-usb-3.0,2654.html
Interesting... If you can get an integrated 5770, whats stopping them from integrated 5870?