Definitely some form of housing with decorations, like they have done it in LOTR:O for instance.
- Maybe this, too.
5.) Guild Capital Ships - Floating museums of a guild's accomplishments, complete with cantina and unlockable mission terminals based on ops or PVP achievements. An intuitive way to evaluate a guild before you join, an excellent way for a guild to display their super-awesomeness, and a refuge from overcrowded (and laggy) fleets.
A few new species.
Barber shop would be very excellent to have in the game.
Expansions with increased level caps and a chapter four.
More developer interviews of them talking about the game and planned features.