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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I'm suspecting that the Vanguards are a elite/higher level of Guardian. I believe Vanguard is not a class but rather, a status or level. For example. Vanguard Warlock, Vanguard Titan and Vanguard Hunter.