I know the return of the Joker as a belted-on-face slasher murderer is part of a new version of "A Death in the Family", a crossover which is running through the DCnU Batman-related titles. And it is of course named after the famous 1988 storyline where the Joker (and fans) killed Jason Todd. DC is obviously hinting that some Batman Family member is going to die.
Then I get an email from DC Entertainment touting a "Nightwing 101" sale:
And the ad shows a previous cover where Nightwing has a target on his face.
Coincidence? Redirection? Or telegraphing the outcome of an upcoming storyline (which DC has managed to do for decades)?