It's interesting because we now have two sets of rumored voice actors. Yesterday, we got Jason O'Mara, Jerry O'Connell, Tara Strong, Rainn Wilson, Bruce Thomas and Vanessa Williams. Last year, we got Kevin Conroy, Steve Blum, Jill Talley, Tasia Valenza, and Wally Wingert. Granted, this could be just made up. But the possibilities...Assuming it's in-continuity I don't think they would bring in someone who already had such a high-profile role from another movie to play a different high-profile role .
It would also mean O'Mara's Batman fighting his dad, since Conroy voiced Thomas Wayne .