User blog comment:The Brave Wolf/Assassin's Creed IV or Batman Arkham Origins?/@comment-5150860-20130429153030/@comment-3046679-20131009125124

You realize it's Ezio's voice actor providing Batman's voice.

And if you've heard the trailer, he does a good job of filling in for Conroy, since the latter wouldn't be able to pull a really young impression of himself, no way around that.