VMworld 2016 will take place in Las Vegas Aug 28 to Sept 1st: VMworld.com: VMworld 2016 US
If you plan on going don't miss the Wednesday 31, 12:30-1:30 pm session "Developing HTML Plugins for the new vSphere Client" where I and other VMware engineers will answer your questions.
It'd be best if you have time to check out the new HTML Client SDK by then but it's ok if you don't :-)
If you are coming to VMworld and cannot attend that session feel free to reach out to me via a private forum message. I'd be happy to meet to discuss your plug-in development and answer your questions.
--Laurent