This is an MMO and they will be expanding the known Star Wars Universe as most every Star Wars game has done before. So expect to see "New" lore added on as well as planets. (Maybe it dosen't exist because it was secret and destroyed by the Emperor then covered up? Nobody knows.)
Aside from that, I'd LOVE if they take some attempts at classic Star Wars planets like Naboo and the Wookie Homeworld. As well as some other iconic planets from the movies and books. However, we can't expect everything, not this early into the Game's history.
Just wait, 1.4 brings more Story. And you always need more places to put story.
See that's where I disagree, Bioware should stick with classic star wars planets and themes until they get big enough, then give them room to do this,