Some thoughts after watching the video. This is way cooler. Since the reflector is transparent, you could put a kinect-like camera in the center (something with depth mapping) -- pointed at the viewer. With some head tracking to "rotate" the display, a reasonable 3d face-to-face chat system wouldn't be impossible since both sides could "see" a 3d representation of the other side, and the gazes of both parties could be looking naturally at the eyes of the other participant (if the camera is eye level).
edit
Some thoughts after watching the video. This is way cooler. Since the reflector is transparent, you could put a kinect-like camera in the center (something with depth mapping) -- pointed at the viewer. With some head tracking to "rotate" the display, a reasonable 3d face-to-face chat system wouldn't be impossible since both sides could "see" a 3d representation of the other side, and the gazes of both parties could be looking naturally at the eyes of the other participant (if the camera is eye level).