i do believe there was a radio like that in the Hitchhiker's Guide trilogy.

all the controls have been designed out, so one had to wave a hand in the desirable direction, and hope for the best. one also had to sit absolutely still or the radio would lose the channel setting.

i can't wait.

Well they already mentioned the obvious problem with unintentional gestures, but I don't believe that they will manage to filter them out. I can just imagine someone waving to their mother as they enter the room, and this thing switching to a porn channel and maxing out the volume. Hmm.

"such as an outstretched palm with the thumb pointing upwards to turn the TV on."

And I thought we were supposed to be reducing standby power consumption nowadays...