Holograms you can touch!
Normally we think of holograms as a projection of light. Immaterial. But body-tracking and ultrasound will enable physical encounters with virtual objects. It's a paradigm shift in design. This will bring dematerialisation to a new level. We won't have to produce objects like keyboards physically any more.
Someday we'll just have virtual clouds around us. They'll inhabit our physical world but follow virtual rules.
This is how we could apply this technology to the interior of a car. Anything apart the seat and the steering wheel could be a virtual structure. You would just download it and customise it. The controls would appear and disappear on demand and respond to your movements. The glasses could hide the external structure of the car, leaving you with 360° vision.