Dragon Magazine 277 had an article called Greyhawk 2000. It contained some ideas about how Greyhawk might look a few hundred years down the line.

Amazing Engine had a setting called Magitech. It's not that far off from what you're looking for, to my mind.

The old DragonStar setting had an SRD, and had a lot of cool ideas that you can steal. For instance, there's a version of cyberware called 'spellware', and there's the 'soulmech', a sort of full-body robot for a soul.

d20 Modern had a monster book called ... Menace Manual. It can help you recontextualizing some of the monsters, and give you ideas about new monsters.

Xcrawl took the dungeon crawl and made it an extreme sport in a more modern context.