Hello,
I've not had the chance to try 4.5 yet, but in a thread I saw reference to a supposed cluster level 4.7.
I didn't find anything special in release notes about it, its features and matrix of compatibility levels usable in 4.5 (only 4.7 up or what?)
I found this bugzilla, now closed, where in some part it was asked to file a doc part
https://bugzilla.redhat.com/show_bug.cgi?id=2021545

Any further information?

BTW: what are the versions of libvirt and qemu-kvm used in latest 4.5.x?

Thanks,
Gianluca