I'm actually working on 3 expansions right now as part of the Kickstarter campaign stretch goals!
One is basically done sans art and is called Love & Lust. It centres around romance, family structures, relationships, and intimacy and how the different alien species in your setting might express of experience such things.
Next up is A Guide To Fauna which is a xenozoology centric expansions where you can help ferry animals off of a doomed planet and have to fill out Species Files for them to work out what planet they would be best suited on.
And finally, War! is an all out galactic war between the Unified and the Free. It adds a tonne of new combat focused mechanics and Missions and lets players either join in on the war or try to remain outside of it.
I have plans for other expansions as well but that's the what's coming out hopefully before February.