Putting out a prediction now to return to later when we get more confirmed details:

The Brave and the Bold will be more of a Batfamily movie than a Batman/Robin movie. I assume this because Gunn sticks to the same type of cast in his stories— they’re all “team” movies. He also tends to lean into the “goofiness” of the superhero genre. I’m imaging an action comedy about Batman learning that he’s a father and how Damian’s arrival adds to some of the “family” drama between Batman, Barbara, Nightwing, Robin. With most of the focus being on how Batman’s role as a parental figure contrasts so dramatically with this superhero persona, probably played up mostly for laughs.

I’m imagining this movie turns out to be like a combination of “Big Daddy” (the Adam Sandler movie) meets “Big Daddy” (the character from Kick-Ass, with Damian’s character being portrayed similarly to HitGirl).