I do know, however, that the last faction for the last DLC is named "Queen" so those of you saying that we may be fighting the queen are wrong. Especially, because if you payed attention in the story mode visiting the reef, the Queen says "Should the Awoken ever need an ally, I will call on you. And expect you to answer."
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There is literally a picture of an archon Priest on the cover of the DLC. Just like crota was.