It is a brief video at just over two minutes, but hey we will take anything we can get at this point. The UI seems smooth, even with TouchWiz UX integrated.
There is a fourth button on the bottom left in addition to the three default Honeycomb keys. It looks like a screen capture icon, or perhaps a shortcut to the camera application. I do not think that it will be in the full version of the software, but an interesting sight.