We know a decent amount about the Destiny universe with the release of the vidoc, but what significance does the logo have with the story? Halo's logo was... a halo. Reach's logo was Noble Team's insignia. What will the Destiny logo represent? A sort of flag representing the last city? A banner of the city's military? Feel free to speculate.
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Maybe the three ends of the tricorn represent the three classes. And the middle section... The Vanguard possibly? (This could apply since you can become a Vanguard whether or not you can pick it as a class). If it is not the Vanguard, I would bet it is the Traveler. With the combination of all 4, it represents the City.