As the second official trailer to Batman Arkham Knight has been released, Scarecrow and Arkham Knight appear and speak. In this article, I have identified the most possible voices of the characters:
The Scarecrow
While not fully seen yet, Scarecrow is intending on engulping the entire city of Gotham with his fear gas which will unleash everyone's worst nightmares. After listening to Scarecrow in the new trailer at a much more clear tone of voice, he is rumored to be voiced by Daran Norris or Richard McGonagle.
Now for the Arkham Knight. After listening to his voice at the end of the trailer, he is speculated to be voiced by Diedrich Bader (the voice of Batman from Batman the Brave and the Bold).
Surely we we're all hoping for Christopher Eccleston from Thor the Dark World would have the oppertunity to do the voice for the character in the game but he did not. But at least we have someone other than Batman actor Kevin Conroy doing the voice for the character otherwise the casting in this game would have looked cheap and retarded.
Anyway be sure to keep track of more updates on the game once they show up.