According to the BBFC, the home video release of Batman: The Killing Joke will contain a sneak peek of the next DTV release, Justice League Dark. What this means for Guillermo del Toro's long gestating live-action adaptation is anyone's guess. is del Toro involved with the project? Perhaps WB wants to test the waters by gauging interest through a less risky market?
Batman: The Killing Joke's World Premiere has been confirmed for Friday, July 22, at SDCC. That's one day before the film is made available for purchase on select digital platforms. In all likelihood, WB Animation probably wanted to save the announcement for SDCC but someone forgot to tell the British Board of Film Classification.
[Side Note: Does the UK spell "peek" as "peak"?]