Neverwinter Nights 2 will introduce a lot of improvements from the previous version.
First of all it will use the 3.5 D20 ruleset and not the 3.0 like the first game did.
The graphical engine has been completely redone. The area maps will be finally no more based on tiles, so that they will be much more customizable. Sadly the world will still be in a fake 3D system. There will be mountains, hills and any kind of slopes, but no jumping or flying.

The new toolset for creating custom content is also amazing. Players will be able once again to create their own quests, NPCs, spells, equipment and everything else needed to make full playable modules.
Like in the first Neverwinter game, modules will be playable as singleplayer games or in multiplayer.

Some time after the first Neverwinter Nights was released in 2002, persistent worlds also started to appear, like the most famous ones Higher Ground, based on the Path of Ascension module, or the Forgotten Realms: Cormyr, which simulates the entire kingdom of Cormyr and is based on official Dungeons and Dragons material.

Since the Neverwinter Nights 2 toolset has been already released to the players who preordered the game, we can expect new modules and persistent worlds to appear very soon.
In particular the Rogue Dao Studios already announced the Planescape trilogy, a massive campaign offering "45 hours of gameplay, 16 adventuring companions, an epic main plot and a slew of dynamic side quests".

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