The reimaginings of Superman and Batman were announced in December 2009 as original graphic novels that would be released this year.
Confusion arose during Comic-Con's Superman: The Man of Tomorrow panel, when Superman: Earth One writer J. Michael Straczynski was reported as suggesting that the hardcover release would be followed by single issues.
"Our plans regarding the 'Earth One' line of original graphic novels have not changed," Jim Lee and Dan DiDio told Robot 6.
"They will serve as new, unique and compelling reinterpretations of our key characters in original graphic novel form, by some of the biggest names and brightest stars in the industry."
Straczynski said that he thinks confusion arose when he mentioned the 'Earth One' graphic novels and then the single issues of his The Brave and the Bold series.
Superman: Earth One is out in November.