According to Bleeding Cool, the publisher is about to release a second wave of the milestone issue following its sellout performance at retail level.
The comic attracted media attention thanks to a nine-page short by screenwriter David Goyer, in which the Man of Steel seemingly renounces his US citizenship.
DC has since denied that the story is anti-American, pointing out that it was never revealed whether the hero went through with his plan, and insisting that the scene be viewed in context.
Featuring a 50-page main story by Paul Cornell, the landmark issue also includes contributions from Lost co-creator Damon Lindelof and Superman: The Movie director Richard Donner. The lead piece depicts Lex Luthor battling Superman and the rise of the Doomsday clan.
Action Comics #900 arrived in stores last month. DC is expected to officially announce its second print run soon.
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