Roger Craig Smith is the voice of Batman in Arkham Origins. Kevin Conroy is voicing Batman in the next Arkham game.
Along with the new trailer came with some information about the voice actors. The voice actor for Batman was revealed to be Roger Craig Smith, known for playing Chris Redfield, Ezio, and Sonic. Joining him as the Joker will be Troy Baker, known for playing Booker DeWitt, Vincent Brooks, Nova, and several others.
Now comes the confusing part. Kevin Conroy said he would be playing Batman originally but what happened? Well as it turns out he is playing Batman, in the next Arkham game. He revealed this in a twitter message that was later taken down. Images of the message still exist though.