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I can't label a "killer app", but smart watches have opportunities a smartphone doesn't. The most obvious is the opportunity for biometrics, as they rest on your skin.

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Thats a truth few wearable companies understand. Many just shove the same functionality of the phone onto your wrist, which is the worst of both worlds. They miss out on the unique opportunities wearables have and focus on smartphone features that are sub-optimal (at best) for a wearable.

Pebble is the leader in this way of thinking. They are showing more innovation than Apple with the announcement of the smartbands. Opening up a world of possibilities for software and hardware engineers/ideas

Specifically which biometrics? Perhaps the sensors still need to be invented but what would you like to track regardless of technical feasibility?

I'm not close enough to biometrics to know what is truly feasible, but I would think you might be able to get SPO2, bpm, EKG, body temperature, maybe even hydration... Then from there you can start building second-order measurements, like how much time you spend at your resting HR, how quickly you return to resting HR, how well your lungs are working, sleep activity. From there maybe you could even extrapolate that data to give feedback. "Dave, your temperature has been gradually increasing the last 36 hours and your skin is unusually clammy, you might be on the verge of a cold" Or maybe "Dave, your SPO2 is falling and your bpm is rising rapidly, you are going into shock, seek medical attention immediately". History is useful for these measurements- what is "normal" is different from person to person, so a running history could let you discover these things earlier.

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