Some select developer quotes from the official NWN2 forums...
In regards to henchmen...
"It'll be a multiple henchman system."
In regards to the single player campaign...
"We are planning to make a great single player game in the same vein as other games we have made in the past like Torment and the Fallouts. As for Diablo 2 being a great CRPG - it is. Would I say it's a great story driven CRPG, no. Just like I wouldn't say that Torment was a great combat driven CRPG."
In regards to the game engine...
"We are starting with HOTU with upgrades, a bunch of the code, particularly on the graphics side, has already been changed."
More on the game engine...
"We are spending a lot of effort on re-writing aspects of the engine to make sure they are competative with products coming out in 2006. If we did just minor changes to the graphics engine that wouldn't happen, so of course we are making a lot of changes. Plus, we are very familiar with the engine already, because of KOTOR2, which means we know what we are doing when we change things.
We are going to keep some things the same. I'm not going to list them all, but they are things that should logically remain the same. Will the Toolset be completely re-written? No, since it works and people are familiar with it. But, it will be updated.
The funny thing is that while a bunch of people here are all down and depressed about how horrible the game is going to look, we are actually completely jazzed here at Obsidian. We are actually getting the time for once to make most if not all of the changes to an engine that we want to make which will really make the graphics and gameplay amazing."