I hope to see grungy, dirty locations. Everything in the prequels is too pretty and perfect.
Let's see more of that underworld. I've been checking some of the "safe for work porn" subreddits. Some great shots of villages, cities, countrysides, etc. in those pages.
One setting we haven't had in a SW movie yet - A CEMETERY. Shmi's grave doesn't count. Sorry I don't have specific names or locations - just a general environment idea.
Another idea - a gold mine!