Bungie's marketplace is not full of new goodies, not the least of which is are T-shirts for each class. There is are beautiful adornments for Titans, Warlocks, Hunters, and..... Vanguards. Considering they are all matching in basic layout, I think we finally have confirmation that Vanguards will be a playable class in Destiny!
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Also, the FOTC shirts say Vanguard on the back. Vanguard is definitely a mystery.