Because that’s what you do now.
Comic Book Resouce spoke with producer James Tucker:
“This will definitely be the first salvo in doing new movies that are in continuity with each other,” James Tucker, producer of “Justice League: War” and multiple DC animated projects, told CBR News during the west coast premiere of the film at the Paley Center in Beverly Hills. “Our next movie’s going to be ‘Son of Batman,’ and that Batman will be the same Batman that you see in ‘Justice League: War.’ Basically, we’ll have two concurrent series of Justice League movies and Batman movies, and they’ll be in continuity with each other. So it’s kind of world-building.”
In a world where Marvel is raking in big bucks and basically guaranteeing ongoing viewership for their movies by tying them together my only real question here is “wait, why weren’t they doing this already?” DC already puts out a boat load of movies and it makes as much, if not more, sense that they would have been doing this for some time.
Hell, weren’t Batman: The Animated Series and the other animated shows of that era in one universe? I thought they were. Then again, Batman: TAS was the only one of those I really watched soooooooo yeah.
Anyway, moving forward it looks like they are going to do three films a year, two of which will be in continuity and the remaining ones will be one offs and alternate universe stories. I’m cool with that. Marvel may be better at block busters but DC has always been great at animated stuff and TV.
Plus, in Justice League: War, the first of this new continuity and coming out tomorrow, Batman totally uses slight of hand to steal Green Lantern’s ring.
So I might even check it out.