User blog comment:B214/High School DxD EX/@comment-117.195.118.24-20150629125656/@comment-24502975-20150629201443

@Gooer It's hard to say until we get our hands on the series itself. Issei's children are definitely canon, and the story taking place during weak-ORC timeline implies the kids have to be at least teenagers and well beyond their parents' abilities at that time. They'd (ORC/Azazel) have to get their memory erased at the end for it to be canon since it was never brought up again (obviously because Ishibumi didn't plan it at that time). If it's the stepping-stone to a sequel then it would most likely be entirely canon. And apparently fans in Japan can get BD1 early in an event tomorrow so maybe they'll leak some info (or scan it already).