Stellaris: Federations focuses on improving diplomacy while also introducing various origin stories for empires.
Paradox has delayed Stellaris: Federations to Early 2020 as it is "taking more time to make sure that the next update is going to be amazing".
The new Stellaris expansion will introduce a range of origins for your races, and the best of these Stellaris Federations origins? The Doomsday scenario.
Stellaris will receive two more content updates before 2019 is done in the shape of the diplomacy-focused Federations expansion and Lithoids Species Pack.