I outsourced your source to sort through all sorts of rumors and here say.
They came up with the same sort: that image is from the new strike where you fight 3 taken guardians at the end.
PoE is actually the [i][b]last[/b][/i]thing anyone is asking for an update on.
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I was thinking the other day of a raid for Destiny where the people in the Tower turned on you and you went back and had to fight all the leaders (like Shaxx). So you are fighting guardians with their abilities. seems kinda cool if it is indeed 3 taken guardians that we fight. I am hoping to get golden gunned by the taken hunter