...extended recording of video and audio could be accomplished through a thin USB connector wire (painted to match hair and skin color) hidden behind the neck, leading to a large external battery hidden...
If we're already to the part about painting wires to match skin color, google glass isn't the stealth recording device that's going to be on the other end of that wire.
This is the kind of stuff that until now, only major intelligence agencies could do with very expensive surveillance equipment.
'Major intelligence agency' is apparently now code for 'anyone with a few hundred dollars and an Internet connection'. Google did not invent the concealed camera!
If we're already to the part about painting wires to match skin color, google glass isn't the stealth recording device that's going to be on the other end of that wire.