A lot of potential
With a bit of effort I could probably come up with 1/2 dozen new applications that folks might use everyday. For starters - some carmakers are talking about heads-up displays reflected off the windshield, but it might be better to just wear these and have the car talk to them. You could include stereo cameras on all four corners of the cabin, giving stereo vision that can see over the car in front of or behind you. These might be the same ones the car is using for automatically maintaining distance, monitoring road conditions, etc.
Right now I'm using a ViewSonic projector to display a 1080P image on my wall for a second screen, and I'm running the Compiz Desktop Cube to give me four workspaces. All that could be done inside the goggles with no worries about darkening the room. I've wanted 3D workspaces / "desktops" since at least 1978, when I first started working with 3D programming. With these goggles I could wander around the house, go get a drink, etc. while watching a video, or shift from sitting to standing, change rooms, whatever while working.
Biting the hand that feeds IT
