Using the Playstation Eye, the PS3 version of the game will allow players to wave their hands underneath the camera to navigate the game's overhead map. The feature is currently only being developed for the PS3 version, as the 360's Vision Camera lacks the stand to hold the camera vertically.
Of course, like head tracking in Boom Blox, this somewhat ancillary feature might not make the final cut of the game. We'll keep our fingers crossed (and moving in a counter-clockwise circle, which is how our own fancy gesture control system knows we're being sincere).
