TDS-1 payloads include instruments to track ships and monitor the sea surface for freak waves, and even a self-destruct "sail" that will pull the spacecraft out of the sky at the end of its mission.
Using the Sokka unit basically involves kicking a ball against a flat playing surface containing a number of electronic sensors that monitor accuracy and technique.
In addition to its primary hardware specs, Surface also features a built in kickstand, which essentially turns the tablet into a monitor, and also a 3mm thin case that includes a multitouch keyboard.