There aren't that many details about this yet, but this year's New York Comic-Con will feature a first look at a Batman Ninja animated movie.
Stayed tuned for further updates.
Source: NYCC.comOctober 05, 2017, 12:45 PM - 1:45 PM
Main Stage 1-D Presented by AT&T
Warner Bros. Japan and Warner Bros. Home Entertainment team for an eye-popping addition to the Batman animated legacy with Batman Ninja, a spectacular, all-new anime film coming in 2018. Be among the first to witness the premiere of colorful footage from this imaginative take on Batman and many of his connected characters. Panelists will include director Jumpei Mizusaki, character designer Takashi Okazaki, screenwriter Kazuki Nakashima, English-language screenwriters Leo Chu & Eric Garcia and some potential special guests.
Stayed tuned for further updates.