I would like to know if solarwinds is planning any monitoring/management support for vmware nsx in the future?
As of the moment, I have not seen any support on VMware NSX reference to NPM. It will be a good idea to submit it as a Feature request.
Network Performance Monitor Feature Requests
There is a feature request at https://thwack.solarwinds.com/t5/NPM-Feature-Requests/Vmware-NSX-Support/idi-p/550421
Vote it up!