An opinion; I feel like that was really made to showcase the strong aspects of this film and not just build hype as a regular trailer would. Long scenes of dialogue and a display of what the action sequences are and will be. This seems very much like a way to change the narrative regarding DC films. I am very impressed with this very proactive step in the marketing.
As a dc fan, I really hope it succeeds. The trailer was good and this is also kinda good, but we all know that the final product could be alot worse.