Apple patents are often quirky, April Fool's-esque, and rarely see the light of day, so be sure to consider that as you view their latest. It's one that marries proven MacBook Pro technology with unproven, kitschy pico projectors. Hilarity ensues.
As you can see in the diagram, the projector is positioned as such so that the user can use the laptop while projecting an image for others to see. MacBook Pro upgrade/update rumors are legion these days, but this is a new one.