Uncanny Dodge

While Obsidian has not confirmed the existence of uncanny dodge in NWN2, it is a class feature of both the barbarian and rogue class which have been confirmed.

3.5 Uncanny dodge
A character with this feature can react to danger before her senses would normally allow her to do so.

She retains her Dexterity bonus to AC (if any) even if she is caught flat-footed or struck by an invisible attacker. However, she still loses her Dexterity bonus to AC if immobilized. If the character already has uncanny dodge from a different class she automatically gains improved uncanny dodge instead.