I had the chance to try it out at the Cebit
I can say it is great!
First I was suprised and I didn't know how it should work. 5 Minutes later I was playing UT04 with it.
Here how it works actually:
It's all about your chin^^ You are moving you forehead with your chin. If you put up your chin a little bit, you'll jump. A little bit more: you are running forward. Much more: you are shooting and running. If you are looking fast to the left side (just with the eyes), you are jumping there. It's the same if you are looking fast to the right side.
Ofcourse you can configure it for your game and settings.
It so much fun!
You need still your mouse to look around, but you need actually no keyboard.
My informations are at the moment that it will cost about 300$ and will release Q3 2007
But it can change everytime.
I just can't wait for it, but I hope it won't cost so much so I can buy it
btw: sorry for my english