That is coming in the second half of the crisis update, just want to roll out this chunk of content first, it will have a event chain related to it that gives the player an easier solution to solve it, at a cost.
The progenitor components will be unlocked as a bonus for clearing the other 3 events and capturing the 3 leviathan ships, with addition of a new shipdesign unlocked based on that tech.
Think babylon 5 whitestar, though style will be similiar to spaceship yamato to adhere to the basic shiplayout of stellaris.
And after that we come to the last part, the addition of 3 roaming first one ships that act like the enclaves of the leviathan dlc and another optional boss encounters if the player choses to attack them.
And that more or less concludes the LEX content and I will take some time to polish it.