The video above says it almost all on it's own.
I see a fixed unit mounted to the overhead shelf of my computer desk though.
Just imagine this coupled with a PC with Dragon or whatever speech recognition. The keyboard, even a projected one then becomes a minimally used part of the system. It's then a matter of 90% + voice and graphic user interface.
Another application would be as a variation on the overhead projector as control of a regular PC display projector for large or small group presentations with group interaction including immediate inclusion of group input in the presentation content.
For those interested in (or capable of understanding) more details of the design concepts see the video below. It's a bit over my head.