This is how you do a trailer to a video game justice. What I mean by that is that while most trailers would be content showing off pre-rendered cutscene, after pre-rendered, the Fallout 4 launch trailer actually shows off what you can expect within the game.
You get to see the underlying story and how this mysterious Institute organization has been spreading its tendrils across the wastes, we get to see a number of the major characters that we will be interacting with, and better yet, we actually get to see, you know, the gameplay.
Check out the full trailer below: