User blog comment:Master Sima Yi/Assassinews 05-08-'14 – Assassin's Creed: Rogue announced/@comment-4786308-20141013160942/@comment-5019018-20141013214732

I think Kevin Conroy was busy working on Arkham Knight at the time. Besides, I thought Roger Craig Smith was a great Batman. He's definitely my favourite voice actor out there, that's for sure.

Back on-topic, yeah, I'm not sure why Achilles has a new voice.