It's a combination of a very cool gesture controller chip from microchip combined with the ease of use of the arduino(tm). We also changed the arduino core a bit so that the atmega32u4 enumerates with a serial port, joystick controller and a keyboard. This allows us to play games with gesture control, read x,yz position data and also built-in gesture data including swipes and airwheel. We currently have working prototypes and got so many requests for one that we decided to do a crowd-funding campaign which should hopefully go live on the 14th of April. We are also planning a bluetooth version with battery for wireless gesture control. Our attempt to create open tools for hackers. We are also busy doing a bunch of code examples, which will go on github soon :)
With your experience with the MGC3130 do you know what the smallest 'field' that can be used? Also, if you were to put a TFT display over it, would it still pick up gestures through the display?