Harbinger O Great Justice
I knew basically nothing about this going into the teaser. I was initially VERY hesitant about the sympathetic angle, because of how a lot of people are overly forgiving towards his actions (esp. with him & Harley) – but I really like that they're leaning more in on the criminally insane angle which also helps give context to why Batman always makes a point of having them put away.
The tone dark, broken, and tragic tone is REALLY damn good in this trailer, and the other part equation is that it is meant to feel like a Martin Scorsese film which takes the general comic book tone out a little bit and plays more closely to just good cinematic storytelling, and I think that there's a possibility that it could be properly amazing.