Okay so I have to agree here:
AI War: The Zinth Faction
It is short. It contains no hard to pronounce words. It is precise as to the thrust of the Expansion, a look into - well - none other than The Zenith Faction. It encompasses all implications of said faction regardless of what direction you chose to take it (IE, its not about the Artifacts, its not about the Emissaries, its about the Faction - period.) It is above the blandness of the others but not so outlandish as my suggestions. It would look bad ass in block-form box art. Its honest.
Yeah, that's all true. Good points! The one bad thing about this name is that only about 25% of players seem to be able to spell "Zinth." I may need to rename these aliens slightly as part of 2.0, because everyone is typing "Zenith" or "Zinith" or some variation without meaning to. "Zinth" is made up, and it's nice because it does alliterate with "Zenith" to a degree, but perhaps to much.
Zin
Zint
Zinith
Zenith
Zenh
Hmm... Of course, I am very partial to Zinth already, so I probably shouldn't even bring this up since I'm not positive I want to change it. But people have enough trouble spelling "AI War" and "Fleet Command" (adding an "s" and/or an "er" on those, respectively). Zinth is just begging for trouble in the search engines, although I imagine people will find it okay given the uniqueness of the word, anyway.
EDIT: And then I see that RCIX was just commenting on the Zinth thing. This is a pretty widespread problem, misspelling that ship's name, but it was never a problem when it was just one ship. Now that it would be part of the name of the whole expansion, that will be more of a problem. I'll have to start digging through my phonemes and see what I can come up with.