Augmented Reality
Think back to the 1990's and the "Virtual Reality" video games. You step into a "cage" and wear a helmet...when you turn your head it knows what you are looking at.
This positional functionality is cheap and easy today with 6 axis accelerometers and digital compasses so ubiquitous that they are in nearly every digital device we have now (phones, watches, etc).
I see this developing into a great augmented reality (look it up if unfamiliar) supplement. Think all the data we can have available in the cockpit, but would rather see delivered positionally...traffic and obstacle databases, even airspace and weather.
Imagine you are along the east coast of Florida flying south, you just passed Daytona and you want to fly over the Shuttle Landing facility. You are talking to approach and are approved for the maneuver. As you near it, you see the Vehicle assembly building off in the distance. Approach calls out traffic, but your ADS-B (in and out) is working flawlessly and your "HUD glasses" superimpose a symbol out at your 11 o'clock position, the standard symbol carrat with a -5 next to it. Above you there is a visual "ceiling" for the floor of the restricted area. Off in the distance to your right you can see an upside down wedding cake...ohh that is orlando! Below you you can see the standard symbology for towers.
I even propose a name for this...Super-Duper Synthetic Vision!
The possibilities are amazing