Many people don't know how touch screens actually work. This is why it sounds very cool an innovative to have touch surface made from ice. The reason why I am criticizing this topic is that it could be ANY surface that has not been used yet. Does anyone remember fogscreen? Basically you can make touch screen even to air.
Touch screens are very easy to make. All you need is some kind of source like projector, some kind of surface and motion tracker. Of course there are integrated touch abilities in normal LCD-screens but those solutions are not flexible at all. With only few components touch screen can be placed almost to anywhere. As you can see from this blog these solutions can be integrated to anywhere!
First there is computer that is attached to projector. Projector displays the image to a surface. Then there are integrated touch foil or infrared tracking sensors. These devices are connected to computer. While the computer is displaying the picture it waits signal from the touch sensors or touch foil and responses giving new feedback to the display. This kind of systems turns your finger or hand to a wireless mouse.
Anyways it is good that big company like Nokia promote these new technologies that will make our lives easier and more fun.
http://research.nokia.com/news/11362