Seems that there is an unofficial release date for the recently delayed Batman: Arkham Knight.
Speaking with Groovey.tv at the 2014 Denver Comic Con, Kevin Conroy discussed what projects he is currently working on. He mentions that. Scrub forward to 5:00 in the video above to hear his exact quote:
It was supposed to come out in January, we were working on it for a year and a half, it’s still not done so it’s going to come out next January but I know everyone’s frustrated. The reason it’s been delayed is because it’s so awesome.
While Conroy is a voice actor and isn’t involved with the actual production of the game, his comments at the 2013 Dallas Comic Con accidently outed the existence of a new Arkham game besides Arkham Origins. We now know that game was confirmed to be Arkham Knight so his new comments regarding the release date seem likely to be true.
Batman: Arkham Knight will release on PS4, Xbox One, and PC in (January?) 2015.