Yes, the previews of Quake IV are still persistently sliding along, with GameShark posting up their preview of the Quake IV PC Version, but SP and MP modes, here's a slice:
"The game engine and physics are provided through the DOOM 3 engine which for all intents and purposes, seemed to run much better than it did for Quake 4 than it did for DOOM 3 (comparing the Q4 demo to the DOOM 3 demo when it was shown, albeit that was some time ago), and it featured more players within the game at one time. Granted, Quake 4 definitely was gorgeous, but in no way seemed as demanding as DOOM 3 was."