GLASS is already an amazing device you can use to get all kinds of fun things done. This Stylus for GLASS is designed to take your experience to the next level. It uses augmented reality to control GLASS. You can use something like this to control the GLASS interface and access information through drawing gestures.
Designer Jorge Trevino Blanco is responsible for this concept. I can see how something like this could help folks get more out of their GLASS experience, but I doubt Google plans on introducing something like this.