The way I heard it is you get the exotic class item when you get to be Faction Champion (which seems to be some sort of perk) but I don't know if that is available yet or not. I certainly haven't seen anyone wearing any of those things.
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So far it seems like its not in the game yet, they will likely be released in a future DLC.
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That or it might appear when the Trials of Osiris do. We'll see.