Neverwinter Nights 2 expands with a new pack called Storm of Zehir. This new expansion includes a feature called Overland Map, which will allow you to travel Sword Coast and Samarach, and use skills like Spot and Survival in order to avoid ambushes and even find hidden locations and lost artifacts.
Storm of Zehir also includes a full party customization system that will let you do everything from create a group of fireball-slinging Sorcerers, or create a wall of Fighters, or simply find that perfectly balanced party. It will also feature a streamlined party conversation feature and Teamwork Benefit Systems to make your party more efficient and stronger.
Neverwinter Nights 2: Storm of Zehir has a few updates to the existing system as well. The game will offer new classes (both standard and prestige), spells, creatures and races, thus making the D&D experience that much more complete.
Storm of Zehir is scheduled to be released by Q4 of 2008.