Xen 4.4 is scheduled to be released one month from now and when the release happens of the popular industry-backed open-source virtualization hypervisor there will be a good deal of new features.
Among the features that will be found in Xen 4.4 include improved SPICE protocol support, PHV domU experimental support, para-virtualized GRUB support has been committed to upstream GRUB2, ARM 64-bit (ARMv8) guest support, guest UEFI booting support on TianoCore, kexec support, QEMU and SeaBIOS updates, SWIOTLB support on the Linux 3.13 kernel, and numerous other changes.
Those dependent on Xen virtualization can learn more about the upcoming 4.4 release via the roadmap Wiki page
. Besides working on Xen itself, developers have also been working towards Xen PVH upstream Linux kernel support
as covered on Phoronix a few days ago.