By supplanting Glass' original operating system, Balaban has already managed to create a feature that can perform facial recognition using the forward-mounted camera.
According to Balaban, Google did not react well when he announced his intention to modify their device to recognize human facial features. In response, the company changed the terms of service to ban the practice, though developers at Lambda Labs seemed undeterred.
"Don't worry, we think it's a core feature. Google will allow it or be replaced with something that does," tweeted Lambda on June 1. (Source)