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@gbj_tester
Old people will remember Ergomo who did the same thing for Square taper/ISIS/Octalink. You can judge what a great idea that turned out to be by trying to load their web site today :)
The use of optical shaft encoders rather than strain gauges is interesting, because it relies on measuring time accurately which is potentially easier and more repeatable than measuring the output voltage of a Wheatstone bridge. It would be difficult to implement in a spider based power meter, but it could work well in a hub and might be cheaper, more reliable and more stable than PowerTap's torque tube strain gauges.
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