http://www.guildwars.com/events/ingame/nightfallworldpreview.phpThey have a free trial by download available. If youre intrested... take a look.
"Guild Wars NightfallTM will make its world debut during a massive gameplay weekend?the NightfallTM World Preview Event?on the weekend of September 22?24, 2006. For 72 hours, players, fans, and even newcomers to Guild Wars? from around the world will get a chance to play through some of the exciting new content in Guild Wars Nightfall, immersing themselves in a brand new story of heroes and villains, of a world sitting on the precipice of eternal night..."
