According to an IGN translation, the new expansion is aimed to bring Neverwinter Nights 2 back to the days of the classic PC RPGs Baldur's Gate and Icewind Dale with full party customization, dungeon crawling, and non-linear exploration of the world.
The report estimates the campaign to clock in around 15 hours in length, adding that Storm of Zehir will offer new classes, spells, creatures, and playable races. The game also features an improved economic structure which reacts to the player's exploits, allowing them to ally with trade syndicates or pirate goods on the black market.
Obsidian has since confirmed the expansion's development, but did not specify a release date for the title. Shacknews has contacted Obsidian for more information and will update when it becomes available.