It is strange. Just downloaded and tried to boot in a KVM+Qemu VM targeting FreeBSD 13 (virsh). Booted but kernel hung with an obscure launchd dispatching job message. I haven't used FreeBSD consistently since the 4.x days so I have no idea what this means.

Looks interesting enough to play around with but for such an ambitious project VM support should be one of the first dev priorities not only for dev and testing but for users wanting to take it for a spin.