The OVN project launched today. The OVN application adds routing, switching, security policy and L2-4 ACLs upon many network abstractions. Very cool stuff here. What I found even more interesting was that from the OpenStack survey completed in 2014 was that Open vSwitch was the most tested and used switching platform in OpenStack deployments.
Read more here from the brains trust behind OVN and OVS.
If you want to know about the architecture of OVN, read here.