A few days ago Cisco released a new version of their virtual Nexus 1000v switch, version 4.0(4)SV1(3). You can read the release notes here. Major new features include:
– GUI configuration setup which creates VMware port groups, VLANs, turns on SSH, adds the plug-in to vCenter, and other nifty things.
– ERSPAN Type III support.
– Virtual NAM support. Monitors ERSPAN and NetFlow data sources.
Additional documentation can be found here. Overall, this is a very minor point release, unlike 1(2) which had some major new features.