A couple of weeks ago Warner Bros. Interactive Entertainment delayed the return of Batman</b>. Chinese studio Virtuous Games is porting Batman: Return to Arkham, the first two games from Rocksteady's Trilogy (along with all the extra content), and they're being remastered for PS4 and Xbox One.
Now there are sources saying that the new release date is set for November. According to <a href="http://www.eurogamer.net/articles/2016-07-11-batman-return-to-arkham-now-due-november" target="_blank">Eurogamer, the publisher expects it to be ready later this year, but a new delay pushing it back into early 2017 is not out of the question either. The developer is facing quality issues, for example, with the frame-rate.
Remember that this is all unofficial info, because Warner Bros. repeated to that there isn't a release date yet:
"We do not have a release date yet and will be sure to communicate that once we are sure the game will be ready. We know this is disappointing news, but we feel the extra time will allow the team to create the best gaming experience for our fans."
Rocksteady is currently working on a different approach to the character with Batman: Arkham VR for PSVR.