It is said that the firm is doing this on an unannounced GPU. If they already have silicon, that would put it at the 2400/2600/2900 refresh due out late this year or early next.
As far as we are aware, this is the first semi-publicly displayed GPU with native Displayport capabilities. For those of you who don't know, Displayport is the next-gen digital interface that will replace DVI.
It looks like the transition will begin in earnest in 2008, DRM infestation and all. µ