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Given that people have asked for it since the very first game, probably never?
It's not like there's consistency in the teams anyway. You've got mafia, less-competent mafia, color-coded rival eco-terrorists ("we wear sweaters and hoods in a volcano" vs "pirates, I guess"), Mormons, PETA in armor who are a front from the Illuminati, tactical ninja ex-Illuminati, fashion-obsessed genocidal eugenicists, goofy kids pretending to be gang-bangers, a Big Pharma research organization that's actually a front for a drugged-out xenophile to fuck jellyfish, soccer hoodlums, and angry theater kids living in FEMA tents while cutting class.