There are some elements missing that would definitely give a more star wars feel.
For one I think having a hover vehicle equivalent to other game's flying mounts would have helped a ton. Instead of having to go on a static path with speeders, being able to travel freely around/over terrain with our own vehicles would have really helped immersion.
Instead of just catching the same glimpse of buildings on Dromund Kaas, Nar Shadda, Coruscant or Corellia on every flight it would be cool to fly around different buildings, catch a different point of view, maybe have a building or two where you could see business as usual going on through the windows of the skyscrapers.
On planets like Alderaan it would be awesome to be able to have atmospheric flight between the hills and mountain ranges all the way up to an orbiting Star Destroyer or Republic battle cruiser instead of generic orbital stations and docks.
Bounty Hunters perhaps having their own bounty hunting system tied into some type of open world pvp area would be another huge thing.
Faction defects or having some type of structured 'factionless' option would also be pretty cool , as betrayal and interstellar politics are a pretty big theme in the Star Wars universe. There are touches of this in the game in one of the class storylines (won't spoil it for anyone), but suffice it to say you don't really get much choice in how all of that plays out.