Google have taken to their Project Glass Google+ page to address privacy concerns over facial recognition apps being built for Glass. Google have addressed the public about this subject because there are plenty of people with Google Glass Explorer Edition units.
There's still ongoing worries about privacy over the use of the wearable technology, especially if people start writing Glassware (apps for Glass) that are capable of facial recognition. Google have said they're listening to feedback from early users of Glass and will continue working on their policies on facial recognition software in the near future. What I like to see is that Google are actually listening, and addressing the public over this, instead of not tackling the concerns of people and their privacy.