GalCiv1 had a female leader. A governor. She is either #2 or #3 on the list of 4 names.
I thought several events showed women.
Erm... other then human and Altarians, we definately will not be able to tell what sex an alien species is. Well, not the common gamer. I suppose in-game the particulars could become learned easily enough (ie, perhaps Drengin males are red, and Drengin females are purple, and really old (too old to reproduce) Drengin's fur fade to green. That's up to the SD art team.

).
Remember, in most species on Earth, we cannot tell the difference without some serious biological probing.
What sex is the Yor? Do they even have sex? Sex is for randomizing and mutating your descendant's genetics, to try to find an advantagous edge over their rivals in their generation. It's for widening the species chances at survival. Reproduction of the basic design, while trying out minor variations on it to find the optimal answer for its environment. When you are an artificial being, what is the equivalence design act?
As for hivers... the queen isn't anything but an egg producer. There would be a specialized member of the hive that's the thinkers and planners. But that won't be the queen. It is true that ambassadors won't talk to the queen, but that's because she's just a spawner. No brain there to talk to.
Now, hive minded species, in which each individual plugs into the whole of their community (ie, borgs), that would be different. Many or all might take turns at reproducing. But they would function like a distributed network, so the removal of any individual wouldn't be a serious loss to the OverMind. That's just a lost node, a lost tool of the network. Only if the physical limitations make a particular member type rare (ie, only 3 males left in a colony of 500) would an individual structure/node become more valuable then others.
Anyways, as for more human females pictured in the game, that's fine by me. I'd prefer they didn't do the sex-kitten look or obvious eye candy. Leave that to MoO and its Amazonians.