It's not a full retcon but it definitely tweaks Bane's origin. And I assume the New 52 gave more license to do so than otherwise would have been afforded.
I will say that I love how he approaches the cell where Bane was kept, with the aging and de-aging as the years pass in his mind as he talks with Psycho-Pirate. Just brilliant stuff.
King also puts Bruce at being ten when his parents were murdered, and for some reason I thought the official number had always been eight?