Anyone noticed this Artwork
http://i.kinja-img.com/gawker-media/image/upload/s--l1_J7o6a--/c_fit,fl_progressive,q_80,w_636/v2jjwwi6zf1f0kbf0npn.jpg
I think this shows us the future alliance we will have. They are all (Hunter, Fallen, Cabal) walking alongside, like a war formation.
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That is concept art from way back when the game was first announced.