I see digital touch as "the killer app". The reason for this is communicating with my wife will be much easier. I think contextual based communication can be really powerful, for example coming home with a huge box of stuff from Costco it would be nice to be able to tap on the watch to get her attention to open the door for me as she does not always hear the knock and I'm there fumbling with my keys while trying not to drop the box. (or maybe get a smart door lock that is activated by the watch) This happens on a weekly basis and is just one example of the many ways that it'll make communication more seamless.