Originally Posted by Snydermann

The remote mechanism is a pressure sensitive battery operated sensor inserted into the rider's rectum, called Di3 Supposicon. One squeeze will shift up and two quick squeezes will shift down. It will be very expensive and everyone will buy it because it's the latest Shimano technology. Subsequent Di4 models will be wireless for added rider comfort. However, resale value will probably be lower than other non-rectally shifted derailleur systems.