Question: Who is it that Bruce sees in his dream/vision while waiting for the file to be decrypted? It seems like it might be the Flash, given his time/dimension-travelling powers, but it doesn't look like Ezra Miller and seems to be wearing some sort of armour.
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Chosen answer: It is Flash. He is wearing armour because of whatever has transpired in the future. He often wears an armoured suit in dire circumstances in the comics.
Also, if you look at the bottom of the image frame you can just make out the Flash icon on his chest piece.