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Updated: with images below.

Potential spoilers follow for Justice League #42.

Bleeding Cool reports tomorrow's issue, written by Geoff Johns, will reveal the identity of the Joker to Batman.

That appears to be true, but the kicker is - only to Batman.

Meaning not to the readers.

I don't have confirmation exactly what goes down this time, but a user on 4Chan (for what it's worth) states Batman apparently is told the Joker identity in which he says, "That's impossible," - meaning he knows who it is - and also questions the Moebius Chair about the identity of who killed his parents.

So the Joker's identity is not really revealed, and my guess is never will be.