Xen Orchestra 3.5 is primarily about bug-fixing but there's also a new turn-key appliance using systemd with Debian Jessie in a Xen PVHVM mode. This XOA 3.5 appliance is using Jessie's Linux 3.14 kernel and is reported to have ultra fast boot times and a greatly reduced disk footprint.
Xen Orchestra 4.0 is now going to be the next branch for this software and with it is coming user management for each virtual machine. A Xen Orchestra 4.0 preview version is expected during the Xen User Summit in September.
More information on this latest Xen Orchestra news can be found at Xen-Orchestra.com.