I would like my next car Google Glass enabled. It could display turn by turn directions, warn of upcoming traffic, and let me know what services are available at the next exit.
I can also foresee Google Glass being very useful for complex, domain specific tasks that require your hands: surgery, automobile repair, home construction, cooking, learning to play an instrument, dealing cards, sowing, tying flies etc.
It would hope the UX would be completely optimized for a heads up display.
For example, I would love a virtual pace car that I could just follow. I would slow down when its virtual brake lights went on, I would switch lanes when it did, and I would prepare to turn when it put in it blinkers.
This would require Google Glass to be completely integrated with the car's radar-based collision avoidance system.
I can also foresee Google Glass being very useful for complex, domain specific tasks that require your hands: surgery, automobile repair, home construction, cooking, learning to play an instrument, dealing cards, sowing, tying flies etc.