The online version of Film and Video magazine contains an article detailing the FX work done by ILM for AI.
Seems ILM is using Unreal Tournament, but not like you would imagine at first. Here is the link:
Also on the site there is an article on SIGGRAPH 2001. In the article there are some quotes from Ken Maruyama, ILM's head of the recruiting group. Here is the link: