According to the Hollywood Reporter Michael Cera (Scott Pilgrim vs. the World, Superbad, Juno) has been cast to voice-star as Robin in The LEGO Batman Movie.
Will Arnett is set to return from The LEGO Movie as the voice of Batman, while Dan Lin, Roy Lee, Phil Lord and Christopher Miller are producing and Chris McKay will be directing. The film’s script was written by Seth Grahame-Smith.
The LEGO Batman Movie is slated to release February 10, 2017.
Source: Hollywood Reporter