This has already been leaked but figured, what the heck, it's still worthy of being mentioned.
If you haven't already picked up or secured your copies of this book Dark Night Death Metal Legends of the Dark Knights #1, now's the time to do so before the eventually continue to go up. Seems retailers are already pre-selling these for the $25 or higher.
But this book details the origin of the new Robin King, coming out of the pages of Dark Night Death Metal where we see him being asked by the Batman Who Laughs (who by the way is also transforming into the Darkest Knight, so this book has more coming out of it) to be his Robin King after he whispers his story into his ear.
Have you secured your copy or copies?