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 brought up on screen? Does it appear and then quickly fade away, or does it appear at all? Both cases seem unnatural at least to me, since I'm just not used to it.

Other than that, I think it looks pretty awesome. The multi-finger gesture typing looks pretty quick and intuitive.