It does look neat, but then again, so does all Macs, all looks and no substance.

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Ooonnnly kidding, but . . . I just cannot see how "the wheel" can ever replace the keyboard. A glorified mouse, yes, and it may even enhance gameplaying if the same thing works on Windows-based laptops. But I really can't see how "the wheel" could ever replace speed touch tying. It looks so awfully fiddly if you ask me. And even then it seems to be based on current touch pad technology but only on a much larger scale.
But let's see how it goes. I won't be chucking away my wireless keyboard not just yet.