Well, Crota and Oryx were mentioned in Vanilla story. Not sure what else there was from Year 1 story that could be for a future expansion.
Maybe everything else will be from scratch?
English
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Rasputin. It's goals are to protect earth and we're about to be invaded again by the darkness. Time for Rasputin to really kick it into gear.
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I wouldn't be surprised if we got hints in TTK story missions. I even ones that don't have anything to do with the immediate story.