A while back a buddy of mine showed me some clip on youttube about a new Batman movie coming out. Or at least I think it was a movie. Anyway, the entire clip was just about Joker sitting in his cell but you hear Harley Quinn talking to some guard outside and she ends up killing him.

I'm pretty sure it was a clip from some new movie about the Dark Knight but I could be wrong. The entire thing was CGI so it could be another game? I'm not sure, but any info would be helpful. Thanks.