I'm surprised that they emphasize the fact that the keyboard can be invisible or small. Personally I think that's the most confusing feature because it leaves you tapping on the screen, or website as in the video. That aspect to me is not very intuitive as to whether or not I'm typing currently or trying to navigate the website by tapping a link, etc. Also, if it's invisible, how do you know when the keyboard is brou…
In theory, there are lots of options for skins - fully visible/opaque, completely invisible (with some sort of icon to let you know it's active), any range of transparent, animated effects like heat haze, water ripple, etc. Kind of fun to think about, actually.