From the FAQ:
Quote:
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Headstart Access will begin for those who pre-purchased Guild Wars 2 three days before release, on August 25, 2012. Headstart Access will begin on August 27, 2012, for those who pre-ordered the game.
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It just means you get to start playing early if you pre-purchase or pre-order. Otherwise, you have to wait until the August 28 release date to start playing.