Also in the policies is a clause prohibiting developers from building apps that turn off the display while the camera is active, allowing the user to record people surreptitiously. That's a response to the last major privacy backlash against the device, which focused on its potential for use as a surveillace device.
As Charles Arthur points out in The Guardian, these policies won't necessarily prevent people from hacking Glass to achieve similar ends. And of course in theory you can still use the device to snap a photo and then upload it separately to a third-party face-recognition service — but that's nothing you can't already do with a smartphone.
Oremus is the lead blogger for Future Tense, reporting on emerging technologies, tech policy and digital culture.