I will be revisiting every spoiler race to make them more interesting, plus I plan to add new spoiler races. Some details below for the existing spoiler changes if you want them:
1) Precursors now have 'real' ground forces rather than the pop-up robots. They are still robotic but now you will be fighting Centurions and Praetorian Combat Mechs (plus other types). You will also be able to damage abandoned installations so wiping them out from orbit will no longer be a good option. Because the AI needs to worry about fuel, Precursors may also deploy harvesters and logistics infrastructure to support their forces. Finally, they will have a more consistent approach to the composition of the forces, which will vary by game. This is all coded.
2) Swarm will be expanded to include more ship types, although still no missiles. Eventually, they may become similar to Tyranids from WH40k. They will also have ground forces, which will probably use vast numbers of low quality units on front-line attack, supported by occasional very powerful units.
3) Invaders, which were inspired by Andromedans from SFB will move more in that direction. They will have a consistent plan, rather than being a random menace, and will have bases that support their inter-galactic invasion, rather than wormholes. You will be able to defeat that invasion by destroying the bases.