Thank you, that's what I was looking for, even though it's not really good news. We were prepping our virtual server environment for this as well as prepping to deploy VDI and I was really hoping that Endpoint Protection would continue to support vShield! I do not want to necessarily use the network cache and put extra load on our network infrastructure when vShield gets around this and keeps all of that scanning traffic local to the ESXi host. vShield to me seems the way to go, and is VMware's supported API for this, so I'm very disappointed that Symantec is dropping its support of that out of the blue. Other products like TrendMicro use vShield and to me that is the way to go.
The frustrating part is that in another environment here we deployed the SVAs on ESXi 5.5 and upgraded to 6.0 later and it continues to work fine even with 12.1.6 MP5. The problem is actually deploying the appliances to the hosts, seems like Symantec won't update the java installer to handle newer versions of vSphere.
Thanks again for the feedback, I've marked this solved.