My suggestion would be Ian McDonald. The Dervish House was nominated for a Hugo a couple of years ago. It's about a fairly near future Istanbul, with a large (maybe too large) cast of characters and plenty of tech speculation. He's written some others looking at other parts of the world in a similar way.
There's also Paolo Backgalupi's The Windup Girl, which is kind of playing in the same area, and won a Hugo. Another look at a culturally-different urban future.
I'm not that sure what you're after, but those are the books that come to mind.
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