User blog comment:G0LD3NF1RE/The Elder Scrolls Online QuakeCon Gameplay/@comment-67.237.57.133-20130812125224/@comment-3124449-20130813060230

They would not show the game if it wasn't close to completion (at least the part of it that was showed). They know that some people can't tell the difference between a beta preview and a full release preview, so they will only show what is finished.