They are coming out with a fourth campaign, I forgot what its called. I agree prophecies is better than factions, but I haven't tried Night Fall, I got bored of the game after getting all the good weapons and armor and stuff, so I haven't played in a while. For you it will be good that they added a new feature, if your computer crashes, internet get disconnected, you lose power or anything like that you have 5 minutes to log back in and be returned to your party or whatever if your in a mission which is nice.
edit: this is the fourth campaign
http://wiki.guildwars.com/wiki/Image:Guild_Wars_Eye_of_the_North_logo.png