Search for "Chapters" at the guildwars.com support page and you'll find
Quote:
As you may know, Guild Wars does not have a subscription fee of any kind. Players may choose to support future development of the game and expand their own playing experiences by purchasing new chapters of the Guild Wars story. These chapters will be offered about every six to nine months, and will be competitively priced. Unlike most "expansion packs," the new chapters will be approximately equal in size to the initial chapter of Guild Wars.
After you own Guild Wars, you are not required to purchase the new chapters in order to continue to play. Those who do support the game with the purchase of the chapters will, of course, have the opportunity to continue their personal story. They will be able to experience new professions, skills, items, missions, monsters, and quests. But players who do not purchase the chapters will still be able to play Guild Wars, and will have the opportunity to play with their friends who did purchase the other chapters in some areas of the game.
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and lots of additional information
