This future predictions keynote by Bill Nye makes some pretty reasonable predictions for upcoming city life.
Most of his predictions circle around innovation in bicycling. For instance, he believes that efficient bike roadways will be built in order to offer an alternative to automobiles. He believes these bike arteries will be air tight as to defend against headwinds and will propel tailwinds in either direction. As he explains, it would be much cheaper and better on the environment to travel by this method. These roadways would also be a better long term investment.
Bill Nye's future predictions keynote also makes interesting predictions of convenient showers to account for heat, laundry services that clean your clothing when you get to work, and less commuting due to better mobile communication devices.