Features include:
Storage XenMotion (cross pool live migration and live VDI migration)
Enhanced guest support: Ubuntu 12.04, CentOS/REL 6.2, Windows 8
Updates: Xen 4.1.2, 2.6.32.43, CentOS 5.7
Open vSwitch 1.4.2
LACP bonding
Performance and scalability improvements
Ability to pin Dom0 vCPU
Up to 4 VM starts can now be concurrent
IPv6 support (experimental)