I think it'd be cool to play as the army ants I haven't read through the forum so if someone else already said this I agree with them, I think as many ant species should be implemented into the game as possible that wouldn't be too much trouble to implement
Army ants are normadic and their temporary nest is made of their own body. The dev are trying to implement this lifestyle as close to real life as possible so for now army ants are in thinking box. The same with african driver ants. On the other hand, trapjaw ants are already confirmed to be playable.