As deployed, most OpenStack SDNs will use OVS or similar software on top of a (xen,kvm) Hypervisor, connected to some kind of central controller, which just maybe would look kinda like OpenFlow. But all of this is running as an overlay on top of a much more traditional network.

This is very different than a TOR switch or core-router running OpenFlow. Only a few places are running more than a couple thousand VMs in a single SDN, and its nothing like what is being discussed above.