This is a transmitter that Kendall and JoeCNC cut in order to mount a PipX + Nexus 7 running the AndroidGCS. In this demonstration the tablet is connected over WiFi to a simulation of a quadcopter (basically the Tau Labs flight software ported to OSX with the sensors replaced by a simple physics simulator). The PipX is plugged into USB and is taking the stick inputs via PPM. It is running modified firmware that echos the PPM values back to the tablet as well as transmitting them to another PipX.
At the beginning I fly it like a normal quadcopter, demonstrating arming and flying around. Then I flip the flight mode switch to a tablet control position and can select additional flight behaviors on the tablet display.