The SmartWatch needs to be able to function as a portable storage device. Whether this happens over WiFi, BlueTooth, or direct connection doesn't matter.
Machines will eventually be able to create music that is indistinguishable from human curated music. Given big data and AI, this robo music will easily appeal to the masses. Who will get the rights / proceeds?
Pen projectors with a gyroscope to keep the image steady. Use a track ball as a mouse...
VR meet and greet apps. Rooms you can go into that will load your body into a VR app and headsets that you can wear in order to see the other person.