If the rumors are accurate, this would make a lot of sense. The unnamed villain from JSA WW2 was Psycho Pirate. The next animated movie is featuring John Stewart, the GL from Crisis. The Anti-Monitor, Qward, Krona, and the creation of the Multiverse are all GL concepts.

Fliescher Superman could easily assume the role of the Earth-2 Superman, fighting alongside the TAS Batman and Katic's Wonder Woman. Tim Daly's Superman could watch his Supergirl die. Matt Boomer's Flash might sacrifice himself to save the multiverse...or maybe it'll be Michael Rosenbaum's Wally.

Again, I stress that this is just a rumor t this point, but the pieces are certainly there.

Let's hope the Injustice Earth gets obliterated first