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Right, but no training or learning to be Batman? Just coming out of retirement, not tied to the Nolan series or any other?
He's established in this world already but we've never seen him before.
He's older and headed towards the end of his career. This movie is greatly inspired by
The Dark Knight Returns which saw an older Batman come out of retirement and beat Superman's ass in a big metal suit just like from the trailers.
Look for this film, and Suicide Squad to fill in some of the gaps of his past with flashbacks or dialogue. In this movie he's already fought and defeated the Joker and other villains (probably most of the Suicide Squad), and it looks like he had a Robin who died, most likely at the hands of the joker.