I really hope these things are coming soon! I so dig the destiny universe and what lore they have given us so far, but to have some EU content going would really do so much for taking us deeper into what is ACTUALLY going on in the world of Destiny. And as far as a sandbox goes there is A LOT of room to play around in storytelling-wise.
Just this one Penny Arcade fan fiction comic did more for me than any amount of grimoire cards could, so i'm really hopeful something like this, something more official will be coming down the pipeline soon!
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Would be so exciting to see how they can expand on the bland and mediocre story. I'm sure it would be as bad, only worse!