Highlights for 2.6.27 will include lots of new drivers (including the gspca webcam drivers), support for hardware data integrity checking in the block layer, support for checkpointing and restoring of virtual machines in Xen, the ftrace tracing framework, mmiotrace, the tracehook patches, delayed allocation in ext4, the UBIFS filesystem, multiqueue networking, kexec jump, the extension of a number of system calls for safer user-space programming, and much more. See the short-form changelog for details, or the long-form changelog for lots of details.