It seems as though the letter can be a prelude to the next event that DC is supposedly planning to do. Most likely Johns will be writing the "Trinity War" so it is his nature to put elements, Easter eggs, and clues as to what's next. So maybe Bruce and Barry do remember the Pre-verse, and it will come to light when Pandora makes her presence known to the 52 DC universe. I hope that the back door will remain closed at lease for a while.
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