Linux 3.3 has been released. The changes include the merge of kernel code from the Android project. There is also support for a new architecture (TI C6X), much improved balancing and the ability to restripe between different RAID profiles in Btrfs, and several network improvements: a virtual switch implementation (Open vSwitch) designed for virtualization scenarios, a faster and more scalable alternative to the "bonding" driver, a configurable limit to the transmission queue of the network devices to fight bufferbloat, a network priority control group and per-cgroup TCP buffer limits. There are also many small features and new drivers and fixes are also available. Here's the full changelog.
# A new installer, bsdinstall(8) has been added and is the installer used by the ISO images provided as part of this release
# The Fast Filesystem now supports softupdates journaling
# ZFS updated to version 28
# Updated ATA/SATA drivers support AHCI, moved into updated CAM framework
# Highly Available Storage (HAST) framework
# Kernel support for Capsicum Capability Mode, an experimental set of features for sandboxing support
# User-level DTrace
# The TCP/IP stack now supports pluggable congestion control framework and five congestion control algorithm implementations available
# NFS subsystem updated, new implementation supports NFSv4 in addition to NFSv3 and NFSv2
# High Performance SSH (HPN-SSH)
# Flattened device tree (FDT), simplifying FreeBSD configuration for embedded platforms
# The powerpc architecture now supports Sony Playstation 3
# The LLVM compiler infrastructure and clang have been imported