Whenever I think of a possible new hardware device, (which inevitably involves it being connected to the internet!) my first thought is: how will the UI of connecting to wifi work? Most often with a lot of devices, "setup" == "connecting to wifi", so having an easy way to do this using a standard smartphone based UI is a very interesting idea.

Allowing faceless connections to wifi networks could allow for a new range of small, screenless devices, or at least devices with smaller screens and reduced interaction.