this is a common practice in most persistent world games (like mmos) the content team finishes the main game (the content amount on the main game can be debated and is being so) when they finish it goes over to a team that does polish and bug fixes also no a your quality control team. the content team then moves on to they're next job. what your seeing is place holders for this stuff the patch is most likely to unlock this content and all the patching and fixing the quality control team has done to make this DLC playable. so like i said the amount of content we got in the start can be questioned but what you are seeing in that video in no way shows they cut any content before release just that the planed ahead and are doing what any game company would do for a game that gets post release content.