One thing I did notice is that I can't type when you were doing your demonstration stuff - perhaps some visual indicator of 'who has control' so I know when I can and can't use the site would be useful.
I'd suggest something more obvious than that. A colored bar below the video image, or a big icon floating at the lower right. This is a new style of interaction, and it will help to reduce confusion by being very obvious about the state of things.
One thing I did notice is that I can't type when you were doing your demonstration stuff - perhaps some visual indicator of 'who has control' so I know when I can and can't use the site would be useful.
Looking forward to it.