There's bowling, basketball bug catching, a new playable race, personal ship AI that can take on the appearance of a doltish golden horse, ship upgrades, a new tech system and loads of other bits and pieces. Evidently, developers Chucklefish don't think that's enough and the next hefty update contains all manner of new content.
What do you add to the game that has everything? Starbound's procedural approach to space makes every planet a unique snowflake in an infinite sea of stars.