From this Hollywood Reporter Interview:

So, Batman. Tell us about your take.

It’s very much a point of view-driven, noir Batman tale. It’s told very squarely on his shoulders, and I hope it’s going to be a story that will be thrilling but also emotional. It’s more Batman in his detective mode than we’ve seen in the films. The comics have a history of that. He’s supposed to be the world’s greatest detective, and that’s not necessarily been a part of what the movies have been. I’d love this to be one where when we go on that journey of tracking down the criminals and trying to solve a crime, it’s going to allow his character to have an arc so that he can go through a transformation.

Do you have a title yet?

(Laughs.) Right now it’s called The Batman. What it will be called ultimately, I don’t know.

Have you begun the casting process?

There will be a Rogues Gallery. The casting process will begin shortly. We’re starting to put together our battle plan. I’m doing another pass on the script and we’ll begin some long-lead stuff to start developing conceptual things.

What’s your goal as far as a release date?

We haven’t been dated. I wouldn’t commit to this, but we’re thinking the movie would probably be for 2021, late spring or summer. Warner Bros. has been incredibly supportive and given me a lot of time and shared the same passion that I do for this story.

Sounds interesting. Like the idea of a full Rogues Gallery on display.

With Birds of Prey filming now for a 2020 release, I suppose we should hear something more on The Batman soon.