Would be better to simply rip the images from the video and post them here for the community as opposed to burying the content a minute deep into your video. Food for thought as we're pretty strict with how people post YouTube content here.
Thanks for taking the time to actually type up a proper description though.
Edit: Pet peeve: If it's part of something that was officially done by the developers, then it is a teaser. If it is part of something that wasn't explicitly announced or done officially, then, and only then, is it a leak. How the community does not grasp this I do not know.