Procedural with their impressive cityengine is certainly a company to watch, we have had a chance to use their demo and the ability to import GIS layers, combined with the rapid creation of cities is certainly impressive. As such their work on New York City 2259 is well worth a look.
NYC 2259 by is the extrapolation of New York city 250 years into the future, inspired by the great 1998 motion picture The Fifth Element.
Today's street network of NY, imported from openstreetmap.org, has been extended to a bigger area, available due to the lower water levels in the future.
The example includes grammar rules to create futuristic skyscrapers in two levels of detail as well as flying cars - press play below:
Take a look at the NYC 2259 page for full details...