We are in an alternate universe.
According to the theory of parallel universes, each time there is a decision to be made, from lifting your glass to killing an ant, an alternate universe is created to reflect each of those possible paths. So, in theory, there is a infinite number of universes in which everything is possible. Everything.
Somewhere is a universe where Dinosaurs have humans as pets. No kidding.
So, this is an alternate universe. Superman was raised by a Mexican family and he is more of a grey Jedi than a proprietor of Justice. He can kill if it serves his purposes. His good purposes. He is still the Superman we know. I think. If you count out the awful beard. And that outfit.
Wonder Woman is wearing the most awesome white costume ever and her black sword is badass. Her origin story makes more sense than that of our Wonder Woman.
Batman is, well, a vampire. A scientist named Kirk is turned into a hemophiliac creature after messing his research about vampire bats. His is not Bruce Wayne. Not that Bruce Wayne is Batman. DAMN. Spoilers.
All in all, a great story.