Definitely interested in this.

Ideas:

[b]Bio-Technology:[/b] recently, scientists have discovered how to lab-grow organs and bio-implants, and how to code genetic sequences effectively. However, they require raw material for this, and people in the slums are liable to be "harvested". However, black-market enhancements are big, big business and many slum dwellers have augments of some sort or other.

[b]Toxicity:[/b] as a side-effect of the excessive development, huge amounts of fuels have been burnt and waste dumped. This has raised the level of pollution in the air, water etc. to dangerous levels. The rich and powerful can afford water filtration, bio-implants that get rid of the toxins and so on, but for the average poor Joe life expectancy is thirty if you're lucky and even then you'll be ridden with sores, coughs and other pollution-induced injuries.

[b]People Farms:[/b] The working-class people are no longer produced by conventional means. They are grown in huge batches of pods, like in the Matrix, and sterilized at birth, with their eggs and sperm harvested to produce the next generation. This allows the upper-class to precisely control the amount of workers and the resources they have to spend on those workers.

[b]Matrix:[/b] While we're on the topic of the Matrix... there's an AR system in place for the upper class. They have access to holographic computer panels wherever they are and never need to move an inch to do their work. For relaxation, they can plug into a VR system and be transported to a fictional world of their own or someone else's devising. Black-market VR is another big business, with gangs running "pod spots" where, for a price, you can spend an hour or two in another reality. However, the pilfered technology is dangerous and can have all manner of side effects.

[b]Automation:[/b] Vast computer systems run public transport, building systems such as heating and air conditioning, lifts and fire alarms. It's impossible to go anywhere in the upper levels (where the rich live) without being logged. In comparison, the lower levels (where the poor are) have no such systems, and most conveniences are unreliable at best. However, this allows unregistered movement.

How do these sound?