It's in the expansions. (Destiny)

by Harmanimus , Friday, July 31, 2015, 19:47 (3502 days ago) @ Funkmon

There are also many things in the expansions that are starting to explore some of the hooks that were placed in the core games side missions. Those side missions specifically already giving broader strokes outside of the initial Black Garden arc. The Vault of Glass, Rasputin, and the Betrayal of the House of Wolves were all hinted toward and played with in the core game and have shown up later and expanded on.

I think that one of the issues with Destiny's story is that it is starting so much larger than Bungie's earlier efforts. Marathon and Halo both are very easily contained, but Destiny starts out by telling you this is a large world you won't understand at first.

And I imagine as time goes on those plot arcs will mingle and expand further. It's already been shown that the Cabal will feature more heavily in The Taken King than we've seen them in either of the prior expansions, even if it is ostensibly a Hive-focused expansion.