VMware has made vSphere 6.5 generally available on November 15th, and this includes the core hypervisor platform ESXi 6.5. In the What's New and Release Notes documents you can read all about the exciting new features, but most of them require paid licenses and a vCenter server to centrally manage your ESXi hosts.
This blog post is my first try to explain what free license users and owners of unsupported ("white box") hardware need to know when they are going for an upgrade or installation of ESXi 6.5 ...