After a fan write-in campaign, DC revised the issue numbers to reflect the original starting date of the title, resulting in the next issue being numbered 600.

CNN: DC Comics goes for No. 1, fans conflicted

MSL-DC-00000621 - 622 (emphasis in original) (ellipsis in original).

CNN

Inspired by the "Infinite Crisis" comic books, this game's original story has the barriers between the different dimensions of the DC Multiverse being torn apart.

CNN: 5 video games to watch from GDC 2013