Well, I was all set to pick up the Mac version of Doom 3 as soon it hit the shelves, but it looks as if G4-based systems are left out in the cold. I've heard various arguments as to why this is the case, but really... my PowerBook has a 1.5 GHz RISC processor with a 128 MB ATI Mobility Radeon 9700. It plays WoW just fine. This machine should be capable of at least running a game like Doom3...
Ah well, that's a lost sale from me, at least until we see some G5 'books hopefully sometime next year.