i wouldn't be surprised if they announced it at this years comic con, we dont know their complete film slate for next year
one of the movies is likely Justice League: Throne of Atlantis.
and they've announced that they are doing their version of the New 52, with the end of Flashpoint, JL:WAR and Son of Batman being in continuity. and there will probably be a solo animated Batman film this year, Court of Owls would be a logical choice