When I think about it, Coruscant is really the only PT planet that would be worth going back to. Actually, Naboo might be an interesting place to revisit. And Kamino, if they ever wanted to explain that mess properly (which I don't think they should bother with).
Other than that though, not really. Not much value to any of the other planets in the PT.
I agree that we need some new worlds, or EU worlds that have not yet been seen on film.