This is a perennially thorny topic, including within the team because it's a zero-sum game. Something that is chosen means something else can't be, given our limitations.
So bearing in mind that we are not going to radically alter the map, and can't add any new cultures, what do you think we should do with the last faction slot?
I've included a poll of the broad options - note we don't feel bound to accept whatever this thread produces by way of majority, it's just a point of interest.