Gamedaily has an interesting preview of Nightfall , the upcoming expansion for Guild Wars.
"The gameplay features which make Nightfall unique include a hero system, where the player can choose to play alongside a custom hero. The player will be responsible for helping that hero gain levels along with providing it with armor and weapons. Best of all, controls are being added to the game so that you can direct your NPC henchmen and heroes to specific areas and set the behavior patterns for your heroes. Players will have the opportunity to have up to three heroes on their team, and will even be able to bring them in customized PvP matches. Additionally, interface improvements will be made, combining the skills and attributes window into one, which will allow players to customize their characters in one place."