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Don't worry. According to LaBoule, the 4th faction will have 5 units, just like in the 5th game: 1 old unit and 1 new unit. Two of these units will be female, and one unit has changed gender (it's just unclear whether it's M->F or F->M). It is known that this unit has been of the wrong gender throughout the entire series compared to the 6th game. The champion remains the same, and the faction's style hasn't changed (compared to the 5th game).