I would love to see this as well. I have fond memories of the Forgotten Realms region books, even for the regions that didn't really interest me, they really added a lot of depth to those places on multiple levels.
I never used it but I really loved seeing the most important import and export products of a region. Maybe I'll use it this time!
I would like to see more of the flora and, specifically, fauna, too. Especially the 'everyday' creatures like pets, livestock and beasts of burden. You can tell a lot about a culture by the animals it uses, for what purpose and how they're treated. Of course, they need not be animals in pathfinder.
I'd like to know about the local quisine, clothing, architecture and celebrations and rituals and the little things that come with it, like whether they eat with their hands or leave their shoes outside, their versions of 'signing the cross'. I want to know about sayings and idioms. Really, I want to know a lot. I want to learn the things you usually go on a cultural vacation for and the things you learn because you've been there that you otherwise wouldn't. Did you know that you eat your food with your right hand in India because the other is used for wiping your ass? Thats the kind of thing I'd think is fun to know.
Of course, I realize that I'm asking for a lot. I can dream!