PC.IGN recently made a trip to ION Storm Austin, and now have a Deux Ex 2: The Invisible War preview. You'll be able to find all kinds of information about ION's title here. The preview covers the story, new characters, augmentations in Deus Ex 2, the improved interface, the new Unreal tech they are using and have improved on, and plenty more. All of this info is presented with a healthy amount of quotes from the developers.

The basis for the AI comes in alert scalability using what Paul referred to as an evidence system, which he demonstrated to us graphically. "This bar on the left side of the character is his alertness level intensity meter. This white diamond here shows where the level is. As he accumulates evidence, this diamond rises and gets him into a more alert state. This is pretty much the way that Thief I and Thief II worked but this time around we're making more of a distinction between evidence." All of the evidence has a different decay and alert level. On the low end, if a guard saw something out of the corner of his eye, he'll go to low alert and forget about it faster. But on the high end if you punch him in the back of the head, he'll rise to high alert quickly and won't forget what you did to him.