Architecture updates, drivers, filesystems, networking, security, build
scripts, reorganizations, cleanups.. You name it, it’s there. You want a new firewire stack? We’ve got it. New wireless networking infrastructure? Check. New infiniband drivers? Digital video drivers? A totally new CPU architecture (blackfin)? Check, check, check.
The kernel devs worked overtime on this new release it seems. Although there are many updates, this particular kernel is still in prepatch status, so chances are bugs will be floating around. Use at your own risk, and help the devs stomp those bugs.
Source: Kernel Trap