Today no Version can be activated by a KMS. There is simply noch Public KMS online. And an Offline-KMS is not yet Released.
Just use a GVLK key while a KMS server is available for you to activate your copy of Windows 8 against it. It always depends on the type of key that you use which defines the kind of activation that you would be able to perform. So to answer your question, any version of Windows can be activated using a KMS server as long as the key is of type GVLK.