Currently in the development stage, the next iteration of Microsoft's Surface technology is probably about two or three years from materializing. SecondLight, as Microsoft refers to the Surface 2, will add a second camera to project images onto a layer that sits above the surface of the screen.
Also new to SecondLight / Surface 2 are built-in infrared sensors, so not only will it detect multitouch gestures, but it will be capable of reacting to mid-air movements without ever touching the screen.
While no specifics have been given about the cameras being used, Eric Klimczak, creative director of Clarity Consulting, which produces applications for the Surface, said he expects SecondLight to make use of high-definition cameras. And he's probably right, given that the Surface has been used for at least one high profile event coordinating Super Bowl security.