Who knows, Vanguard could be a 4th class. They could be a support/healer type seeing as how we have the other Main Archetypes: Titan/Fighter, Hunter/Rogue and Warlock/Magician. The only remaining Archetype is the Support/Healer role. The Vanguard could even be a specialized Class, such as how the Paladin in other games is a mixture of the Fighter and Healer classes, the Vanguard could be a mixture of 2 or more of the classes already revealed by Bungie.
Who's to say there aren't 2 or more classes waiting to be revealed at E3? We've barely been given a tiny glimpse of what Destiny entails, so there's a lot we don't know so almost anything is possible.
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I'm not really saying there will be a healing class at all, I'm just saying there is usually a 4th archetype, sometimes more. I'm not saying the Vanguard will even be a class for sure, I'm just stating my thoughts on the matter and nothing more. I'm eagerly awaiting any and all info we will see in the upcoming weeks, I'm genuinely excited for Destiny.
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The healer role is always a choice within one of the other classes, I have never seen a class that just heals. The Warlock probably has a healing choice if there is one at all.
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I'm not sure that healer makes sense for the Vanguard class considering that if you go to "The Frontier" page on the Destiny tab, Mars and Venus both are blank, saying they are awaiting reports from "the Vanguards" which leads me to believe that the Vanguards are the upper echelon of assault scouts. SEALS, man.