Can I try out new features of the vSphere Client, before they become available publicly?
You can use the Fling of vSphere Client to test new features in the client. Download it from https://labs.vmware.com/flings/vsphere-html5-web-client, deploy it like an OVA and start using those new features. Remember however that you should not install this on production systems. The Flings by nature are ‘experimental and should not be run on production systems’.
If you need support for the Fling, you can get it in the forum at the same link.