Next Generation have whipped up their previously conducted interview with Todd Hollenshead (CEO) and Tim Willits (map designer) of id Software regarding their insights of the development of Quake IV.
Willits on Online Play
"The big difference between Doom 3 and Quake 4 is the amount of information sent over the network. Everything can be dynamic, from the physics to the lights and the characters so there's much more that needs to be squeezed down that bandwidth. Raven reworked the network code and sped up the game logic so you could have more clients, but the biggest trick is this: Quake 3 employed faked physics, whereas the Doom 3 engine is more realistic. So there are still subtle differences that make the two games play differently, but the majority of people will definitely get that recognizable feeling."
