I like this trailer. It gives me chills every time. Yes. this wasn't in the book, but it is only a teaser trailer so there's not a lot of stuff to judge the movie on. It's obviously a Nightmare or a simulation (I personally think it's a nightmare).
There's also no one hundred percent guarantee that this scene will be in the movie or not. Some scenes in the Divergent movie trailers weren't in the movie so maybe that will happen to this movie or maybe not.