Theres a 3min Video Trailer starting at 6min 50secs.
BlizzCon 07 about updates to WoW:Burning Crusade, WoW:Wrath of the Lich King, new abilities, Death Knight hero class, PvP, new storyline, player customization, seige weapons, buildings, guild banks & much more.
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HD version available from w.Gamespot.com