(Today's cities only display the early stages of this phenomenon in the form of large TV screens, lights, people with robotic prosthetic limbs and various other technolgies.)
2) A technopolis is a city where robots and cyborgs are so commonplace that complex computers, robotic parts and artificial intelligence programs can be seen in trash bins and/or are sold freely on the street.
3)A common setting in science fiction stories.
Any 'Future Tokyo' in an anime likely IS a technopolis.
See Ghost In The Shell