A big use I see is in the automotive industry.
Imagine - A solid block of black covering up the sun during a sunset drive, reducing glare. Also, variably tinted windows. HUDs, displaying highlighted outlines of objects or obstacles in the roadway, warning of incoming animals and other vehicles, and a gps system that doesn't require eyes off the road.
Imagine all the Facebook people can do with semi-transparent screens while driving!
Okay, maybe not that one, but there are also applications in the medical field. Perhaps a super version of the google-glass that allows doctors to see their patient's 3D x-ray and MRI while performing surgery - all in real time and aligned with the patient's body.
Basically, HUDS everywhere will be revamped.