In support of Mac, I too would like to see a massively destructive race, one that most AI's hate too. One that can NOT make treaties with anyone...In the files it says that the Xi'Chung were thought to be the creation of another race, how about the 'parents' show up to see how the kids are?

That and the addition of a few new races that use combined tech.(ie a psychic/organic race, a religious/crystal race etc, or heck even a temporal/organic/psychic race

). But the new races I would gladly pay for in expansion pack form.
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"The Empress took your name away," said Chance.
Owen smiled coldly. "It wasn't hers to take. I'm a Deathstalker until I die. And we never forget a slight or an enemy." -Owen Deathstalker.