Linus has just announced the availability of the Final release of Linux Kernel 2.6.39. It was a bit delayed, but finally Linus decided to release it anyway. The reason for the delay was his hesitation since he's leaving for LinuxCon in Japan and these two weeks are one of the most interesting phase in Linux Kernel development: The Merge Window.
Take a look on an article in H-Online about new features in Linux Kernel 2.6.39, since KernelNewbies entry is not yet ready at this moment. It will be released in one or two days in the future, so stay tune