I think the concept is really revolutionary and I would love to see Apple develop it. My ideal design would be BT and the scroll on the mouse would have a depressible button underneath, as do traditional scroll mice. Once I figured out what the ctrl button does, I do not need a two buttoned mouse. However, I keep one around so that I can set the F9 expose function to it. Imagine if this type of scroll could do the same. I am understanding that this scroll is similar to the one in the iPod (which I love).
I am also thinking more of this rendition:
<img src=http://www.macplus.org/magplus/IMG/jpg/souris2.jpg>