It doesn't really exist yet.
But I'll be gone for three weeks, and in the meantime there's a "2.4.0-test1" kernel here. It's not a real 2.4.0 release, but we should be getting closer. There's going to be other test-kernels after this one, and we'll find bugs. And bad behaviour. And wonderful features which we'll document some day.
Alan Cox is most likely to maintain a "2.4.0-ac" series while I'm gone. Not the same thing as 2.4.0 either, but by testing these test-kernels out and giving feedback, we'll get to that some day.
Have fun. And let's see how many people find this without it even being announced
Voor een overzicht van de nieuwe features in de 2.4 kernel kun je dit artikel van Linux Today raadplegen.