Btw Voice is not the only way to control glass. I'm not sure if voice can be eliminated altogether but that should be easy enough. So the second problem is actually not a problem.
It would be amazing if something similar to Leap were implemented. Imagine how cool it would be - you would simply point/click in the air with your finger where the interface elements were augmentally displayed to you.
Granted, it would look incredibly stupid for the unknowing onlookers though.
I think the future of Google Glass is paring it up with tech like what Emotiv has been working on (http://www.emotiv.com/epoc/features.php). It's already on your head and if we can get the Emotiv like tech far enough to understand a few distinct commands it would create some amazing synergy. If it can recognize my when I think "back" or "home" and maybe "up" and "down" for cycling through menus we can save voice for command sequences.
So if you get a message notification on-screen you can read it and just think "back." Glass would interpret it as a swipe up on the touch or saying "back" by voice, and the message will be marked as read and the screen will turn off. I think voice commands are still very useful for what would be sequences like "Give me directions to the nearest Dunkin Donuts."
I'd genuinely not imagined adding something leap. That's a brilliant idea. I guess depending on where it was pointed, your actions could be more or less obvious. I imagine touching different fingers together to carry out different actions.
It could be just a display/HUD for your phone, sure. That might be more human for when you can't use your voice. But most of the interaction Google shows is via voice, so I'm not seeing it yet, and if it's an afterthought, then I'm guessing it won't be great.
You can control it via touch. This info is present in many reviews. Why are you dismissing something without even researching it?
As I said earlier I'm not sure how much can be controlled via touch but that is a not a big problem to solve. Google shows off voice interactions because it is more cool.
Granted, it would look incredibly stupid for the unknowing onlookers though.