"I agree the pointy-headed character models and the menu resolution do feel dated, though. I wonder how hard it would be for id to update or "remix" the game engine with improved surround sound, character models, selectable modern screen resolutions and menus? I would re-purchase this game+expansion again!"
Reading through my copy of Making Of Doom 3, I remember that this title was made right as normal mapping was being used. As such, the base models are extremely high poly count, but then down-sampled to appropriate resolutions for a 2003 PC or an Xbox 1. A normal map is then built out of the lost detail and reapplied to the lower poly in-game model. One would hope that all of the original models are still sitting on id's servers somewhere.
Porting the audio to a modern Vista/7 "wad of raw channels" audio system would be trivial. Hell, it was even the original design until though douchebags at Creative came along. "Hey, remember that programming technique that you single handedly developed back in the Quake 2 days, Mr. Carmack? Yeah, we hold the patent on that now, 5 years later. Put EAX in your game or we're taking you to court."
One would hope that we'll see a treatment like the modern version of Stranger's Wrath out of Doom 3.
