1. A few spaceship's features:
Spaceship customisations - like companion customisations but for the ships. Plus craftable decorations. Plus shelves for displaying achievements such as datacrons or boss trophies. Plus ANY kind of long term endgame purpose related to spaceships/player housing. Guild capital ships. Possibility of Guild vs Guild battles with Voidstar's mechanic on said ships would be also nice.
[it count's as one ]
2. More items bound to legacy instead of BoP.
3. Night/day cycles and weather. Hey, even Luke could stare into the twin sunset on Tatooine!