With the start of 2014, we are in the era of predictions on "the future of X". I came across report and presentation on the future of wearable technology both by PSFK labs and Intel.
It partitions the wearable technologies to three types:
Connected intimacy: person-to-person - tracking devices by persons on other persons, monitoring babies, hug simulation jacket (where a parent can simulate hug to a child from remote) and more..
Tailored ecosystem: person-to-computer - such as bracelet that send hot or cold thermoelectric pulses
co-evolved possibilities: person-as-computer: heartbeat signature as password, operating gadgets by blinking using smart make-up, and computers embedded inside persons.
It will take several years to make them main stream, but wearable technologies are the sensors and actuators of the future.