TVG has interviewed Chris Avellone from Obsidian, who is one of the founders, a Creative Director and Senior Designer. Here's a snip:

What have you learnt from NWN that you will try to open up and expand on?

We're focusing on creating a strong single-player campaign as well as improving the toolset. I think the modding community alone will be pleased with the flexibility with environments, item creation, armor customization, and the global script templates that will make scripting encounters and dialogues much easier.

Read the rest (http://www.totalvideogames.com/articles/Neverwinter_Nights_2_QA_Feature_10050_3995_0_0_0_0 _20.htm) at TVG.