VMware has announced that vSphere Enterprise licenses is EOA June 30, 2016, this also includes Operations Management Standard and VMware vSphere with Operations Management Enterprise.
There was a lot of confusion about what existing customer with this licenses was locked to vSphere 6.0 and older, without upgrading there licenses to Enterprise Plus. VMware has change what was there first announcement, that they had to upgrade there licenses, that's not the case any more.
But if they need additional license they have to buy one of the remaining offerings VMware vSphere Standard, VMware, vSphere Enterprise Plus or VMware vSphere with Operations Management Enterprise Plus.
For more information see: http://www.vmware.com/files/pdf/products/vsphere/VMware-vSphere-vSOM-Pricing-FAQs.pdf
Notes: There is a promotional upgrade of licenses at 50% until June 25, 2016 at 11:59pm Pacific Time (PT).