
vShield Endpoint is now included in every vSphere edition, with the exception of the lowest tier vSphere Essentials package.
I was under the impression that you had to upgrade to the new 5.1 version to take advantage of the licensing change, and get licenses available for vShield Endpoint, but a new VMware Knowledgebase article named KB: 2036875 Downloading and enabling vShield Endpoint on supported vSphere platforms debunks that.
The licensing change makes vShield Edge available for all customers, with an active SnS, running vSphere 5.1.x, vSphere 5.0.x, or vSphere 4.1 U3!