the planets i would say are
Yavin 4 as a world that end with a raid ( for those who have seen the Timeline trailers knows who is stil there)
Kashyyyk. basicly more of a neutral planet with a lot of involvement of the slave traders
Mandalore. Realy who doesn't want the mandalorian home world?
Geonosis. We have seen them outside which is rare, so its time 2 bring the fight too them.
planets i think we never see
kamino. As a big water planet and later rediscoverd before the clone wars. I don't think we realy go there
Naboo. its just a small colony now