Over four years ago was the first time we had heard rumors
that Quake 4 was indeed under development and that it would be developed
by Raven Software while of course working closely with id Software.
Quake 4, which runs off a modified version of the Doom 3 engine, is
finally available today - October 18, 2005. However, the Linux binaries
for the client and server remain curtained. Read on over here.