I think it's about time we see some of the classic planets from the movies/shows enter SWTOR.
We've seen geonosians twice now on Tatooine and Ossus, why not introduce geonosis?
Kashyyyk is a classic planet that is mentioned in game several times and we have the companions to back it up
Naboo while not mentioned a lot has been mentioned at least once in the game itself (can't remember when exactly but I know its mentioned)
Umbara, has a flashpoint, and a stronghold but not the actual planet.
Mon Cala while not exactly a unique setting because of Manaan would still be cool to have access too even if its just a daily area
Im sure there's more planets that fit the description of a 'Classic Planet' better then some of these but this is just the top of my head, especially since a lot of these planets could come with cool new species options (even though they don't match with BW's character profile, would like kinda funny as a mon calamari, or a wookiee trying to romance a companion)