Batman: Son of a Brother

Batman: Son of a Brother is about Bruce Wayne, who finds out that his father, Thomas Wayne has a brother. The movie is still rumored and if it is going to be made, it will come out in 2016.

Crew
The crew is not really made yet, but there are rumors of these roles:

Director: Martin Scorsese (rumored)

Producers: Avi Arad (rumored), Joel Silver (rumored), Jerry Bruckheimer (rumored), Alan Burnett (rumored)

Music by: Christopher Drake (rumored), Frederik Wiedmann (rumored)

Film Editors: Christopher D. Lozinski (rumored)

Sound Department: Robert Hargreaves (rumored)

Animation Department: Kirk Tingblad (rumored)

Crew (Characters)
This is a list of the characters and who voices them.

Batman: Roger Craig Smith (rumored) or Kevin Conroy (rumored)

Pearl Wayne: Steve Olson (rumored)

Thomas Wayne: Linus Roache (rumored)

Martha Wayne: Sara Stewart (rumored)

Alfred: Bill Nighy (rumored)

Joker: Matthew McConaughey (rumored)

Azreal (Jean-Paul Valley): Khary Payton (rumored)