In your opinion what is the one most important difference that Vanguard will have above all the other MMOGs that are out or soon to be out?

Gosh, big question. Sigil has so many talented people working in different areas that I don't feel qualified to comment on what will stand out the most. I suppose that the best way to lump them all together is to say that most standout characteristic of Vanguard will be the degree to which it will involve the player from art to graphics to gameplay.