Many of the buildings depicted here have already been constructed. The biggest project being the Eureka tower -world's tallest apartment building, in the category of highest occupied floor and ceiling level.
Top image, skyline circa 2001. Bottom 2030 projection.
http://www.skyscrapernews.com/images...n2020_pic1.jpg
It is also worth noting the entire port/docks area in the foreground has been relocated from the inner city area and this is a hive of construction activity. APartments, parks, and piazzas are all built of being built in this 'docklands' precinct.
http://docklands.com