I saw in the sticky thread what "gamemodes" the expansion will add, can't wait for it.
But I'm sure at some point the Hydral would like to use some kind of a cloning machine, to feel less alone
Hydrals, who would be the strongest of all races when fighting, would slowly replace the robots.
It could serve as the Hydral ultimate "weapon"/building in Betrayal Mode.
Another idea would be a "prequel" DLC: playing before the Hydral homeworld get destroyed.
The natural goal could be to maintain the longest Hydral dominance over the solar system (preventing spacefarings or homeworld destruction), or even trying to create a federation.
When/if homeworld get destroyed, the surviving hydral/player decides which planet he flees on, and then get the choice to either follow the Federation path or the Betrayal path.