Computer and Video Games have interviewed the Obsidian CEO Feargus Urquhart, talking about Neverwinter Nights 2. Here's a snip:
What's new in NWN2? How have you improved upon the first game?
Feargus Urquhart: The newest feature is companions - we've expanded upon what Neverwinter 1 did with henchman. With henchman you pretty much just hired someone and they did things for you that you didn't really have any control over. In Neverwinter 2 you have companions, you have complete control over them and on top of that they're very integral to the story - they'll go with you, some could fall in love with you and some could betray you.
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the rest at CVG.