This issue is a variant of Justice League (DC, 2011 series) #1. There exist further variants.
"Combo Pack" on cover.
3rd printing cover, $4.99 cover price, combo pack edition.
First appearance of Superman, Victor Stone and Green Lantern. Batman first appeared in Flashpoint (DC, 2011 series) #5.
Jim Lee's new designs for the Justice League. Includes a breakdown of the cover.