Nightfall World Preview Event Limitations (From:
www.guildwars.com updates page)
The following features will be part of the release of Guild Wars Nightfall, but are not available during this preview event.
* Skill Templates - In Nightfall, you will be able to save and load skill and attribute builds to disk, enabling you to quickly switch strategies and outfit your Heroes.
* Hero Battles - After the release of Nightfall you will be able to unlock Heroes for your use with your PvP characters, and you will be able to bring Heroes into a new type of PvP where players can compete head-to-head for the first time.
Also, the following issues are known to exist with the features being previewed during this weekend event.
* Hero AI for using skills is still under development.
* Heroes cannot capture skills using Signet of Capture, nor can they control pets using Charm Animal.
* Hero armor cannot yet be upgraded using runes.
* The visual appearance of Hero armor in the Inventory panel, and the text descriptions of the Hero's attributes and items, do not take into account the sex of the Hero.
* The tutorials in Prophecies and Factions have not been updated to reflect the Nightfall user interface changes.