I'm reading the release notes for vSphere 5.1.0b: https://www.vmware.com/support/vsphere5/doc/vsphere-vcenter-server-510b-release-notes.html and it's saying:
In vSphere 5.1, all new vSphere features are available only through the vSphere Web Client. The traditional vSphere Client will continue to operate, supporting the same feature set as vSphere 5.0, but not exposing any of the new features in vSphere 5.1.
So is the traditional vSphere Client being phased out?