I was just reading the E3 2002: Doom III impressions from Gamespot when @ the bottom of the article I spotted this!

He then wrenched the head off the body and swallowed it whole. It was a shocking ending to an incredible demonstration.

Doom was apparently shown running on a 2.2Ghz system using some sort of ATI graphics card. It's scheduled for release sometime next year. DOOM III - The Legacy Powered by ATI @ E3