Hi
till now it are the rpm's with spice support working without problems (spice works to :) )
there is one issue what I have found, after install does grub2-mkconfig make this entry:
multiboot /boot/xen-4.6.0-rc-2.el7.gz placeholder...
but I think it should be:
multiboot /boot/xen.gz placeholder ...
with the first one it doesnt boot here, grub cant find it allthough its there in fs...