This issue is a variant of Action Comics (DC, 1938 series) #858 [Direct Market Standard Cover]. There exist further variants.
Two covers were done for this issue; one featuring only Superman, and an alternate one featuring Superman and the Brainiac Robot (10 issues for 1 issue mixture). This issue went on sale 2007-10-31 (on time). A second printing went on sale 2007-12-05 with a third cover, the main one with different coloring.
This variant cover was announced after the original solicitation via a press release on 2007-09-04. For every 10 copies of the standard edition, retailers were allowed to order one copy of the variant edition.
Story continues in the next issue. The Interlac dialog on page 15 is translated as follows: "THERE HE IS." and "TURN YOUR LEGION TRANSLATORS ON."