I really wish people would stop calling this language JavaScript. It's not. Its proper name is UnityScript, and it's more like Jscript.NET than anything else.
I usually don't mind that much when the wrong terminology and naming is used, but this specific case was a disservice for me. I was very confused to see the syntaxe he used, yet calling it JavaScript; I thought they used a modified JS syntaxe, possibly pre-compiling it to the C# equivalent.
"But Google Glass is much less ambitious than the computer-mediated vision systems I constructed decades ago."
"I worry that Google and certain other companies are neglecting some important lessons. Their design decisions could make it hard for many folks to use these systems. Worse, poorly configured products might even damage some people’s eyesight and set the movement back years."
Lots more meaty detail on computer glasses in that link.
I submitted it - so I'm biased - but I've actually tried it, it's pretty crazy how it does the mapping over your body (even things like just tracking your gestures).