This is a highly speculative thought, but, have you noticed how the required spec for Doom3 http://www.aspyr.com/games.php/mac/d3/ says 1.5GHz G5. Apple have never shipped a machine with a 1.5GHz G5, is this an indication a Powerbook G5 is coming before release of Doom 3 (some time in Q1 2005), or is it just a typo?