I do hope they have a very dynamic AI in the game. I have installed the Smarter AI scripts done by Tony K from the NWVault and let me tell you something, it makes a major difference in the game's playability. I just went through one of the toughest battles I have ever had in NWN. It was a major spell battle between my halfling wizard and the lich under Luskan. Our minions each met in the middle and we were casting spells left and right. He casts cloudkill, I launch multiple fireballs, he casts chain lightning, I cast issac's Greater Missile Swarm and maximized fireballs.
Poor Tomi was stuck in the middle. Good thing he had improved evasion.
That is something I like to see in NWN 2 but with a controllable party. It almost felt like I was playing a BG2 spell battle.
Darque try this: http://nwvault.ign.com/View.php?view=Hakpaks.Detail&id=4510
It makes the battles far more interesting and tougher. Also it allows more control over the henchmen.