The amoeba aren't playable yet. Also, one of the other factions yet to be released is the Sowers, terraforming robots built by the endless that achieved sapience, and decided to continue their programming by preparing all worlds for the Endless. Even though the endless are gone. Still, neither of them are released, so I can't play them yet.
That's 2 non-humaniod factions out of 8 or 9 planned. Percentage wise, that more than most 4x games I've seen(in fact, the only one I can think of that might come close is Masters of Orion 3....).
And, to tally the votes, so far we have one vote for the United Empire and the Sophons, and 2 votes for Horatio.
Faction wise, we have one vote for 5 other factions, and one vote for 4 other factions.