Smith replaces longtime Batman voice actor Kevin Conroy; it was initially reported that Conroy would not appear in Arkham Origins at all, but he said last week that he is involved with the franchise in some capacity.
Smith's credits include Ezio Auditore da Firenze in the Assassin's Creed games and Chris Redfield in the Resident Evil series. Baker most recently lent his voice to BioShock Infinite protagonist Booker DeWitt, and stars as Joel, the male lead in Naughty Dog's upcoming survival title The Last of Us. He also appeared in Batman: Arkham City as the actor behind Two-Face and Robin.
Batman: Arkham Origins, which is in development at WB Games Montreal, launches Oct. 25 on Windows PC, Xbox 360, PlayStation 3 and Wii U. Check out our Arkham Origins interview and hands-on preview here.