Earlier quoted context omitted.
Whether this will be useful all rests on the quality and differentiation of the haptic feedback. For example, imagine walking down the street towards your destination and feeling the right side of the watch vibrate to signal that you should turn right. If your watch can communicate contextual information related to your intention and local then it will be superior to (1) wearing a socially inappropriate device like t…
The overriding feeling I had during this keynote is that every feature that I found cool in the watch I would much prefer on my phone. Cool watch app? Wait, actually that would be cooler and more usable on a big screen... Haptic feedback? Agreed, awesome idea, but no reason it can't be on my phone and buzz my leg instead of my wrist.
There's a much higher density of tactile nerve endings in your wrist than in your thigh; even if you can reliably feel your phone vibrating in your pocket (I can't!), that's no guarantee you'd be able to discriminate finely enough for haptic feedback to be of use, especially since the phone's orientation in your pocket is not guaranteed.