It's addressed a bit, although the adventure path concerns itself mainly with one city in Cheliax, and that one of the more cosmopolitan and liberal cities. Slavery isn't illegal, but it's much less common than in other places in Cheliax, although it'd be easy to include the theme should you wish to.
Creative Director
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Kintargo's not the place to do a slave uprising plot, because Kintargo is more or less the one place in Cheliax where the citizens generally don't keep slaves. It's legal there, but it's NOT popular, and those who DO have slaves are pretty quiet about it and keep their slaves as happy as possible. There certainly are slave involved in the revolution, but the numbers are small enough to be more or less inconsequential.
If your PCs want to be, they can be slaves rebelling against their masters. One of the PCs in my PbP campaign is a slave, although the daughter of his master looks like she'll be joining the rebellion as well.