Anna shows interest in playing the role as ROBIN, but Ben Affleck has the much better idea.
They've been together in the movie "The Accountant" and there is a lot good chemistry among the 2, but Anna can't hide her interest to play the role and ask Ben herself, but what a surprise, that The BATMAN had a different idea of being in the Movie together, He wants to star and sing in the sequel of Pitch Perfect.
Source: COMICBOOKMOVIE