Just think though with photoshop and using this screen the precise accuracy you can get with moving your own fingers to lets say cutting out an image. I'm sorry but I can't do that with my mouse very accurately and I think I could control my own fingers knowing where their going and not some stupid rectacle on my screen which if I move my mouse the wrong way I have to start all over again.
This technology gives you a more user friendly interface too I believe because to turn pictures you either need to go into some of the tool bars click here then click there and you get what you want, with this you just turn it with your fingers so it would be less time consuming way of doing things. Your still going to have to go into your tool bars to access different things more then likely but for the most common tasks it will take less clicking and dragging if need be.
As for the keyboard if you saw it was something out of the minority report. He brought it up on screen and was able to type with it and also able to choose the size he wanted the keyboard to be. This will lead to not being constrained by the size that the manufacturers design for their keyboards.
Well those are my thoughts anyways so lets keep this discussion going its getting really good.
*Edit*
After watching that clip shows it would be possible to play games and if you noticed he was sitting down well doing all the motions so you won't have to worry about standing up. The voice recognition though I thought was interesting and for that type of game worked very well. This just further leads me to believe that eventually the mouse and keyboard will become not necessary I won't say obsolete just yet though but thats my opinion anyways.
Well looking at the WC3 video I found a more in depth video of the one I linked in my first post so check out the things this thing can do close up.
link:
http://www.youtube.com/watch?v=-fcKwelEayw&NR