There had been rumors saying that Kevin Conroy would not be reprising his role for Batman Arkham Origins. In response to this, he posted a tweet stating that he is actually working on another Arkham game that has yet to be announced. He deleted his tweet shortly afterwards, hinting that he let the cat out of the bag a bit too soon .
Source
Kevin Conroy's tweet:
"Confusion in Dallas. I am in new Arkham game coming soon, not Arkham Origins coming this fall."