This issue is a variant of Superman (DC, 2006 series) #708 [Direct].
"Printed by Quad/Graphics, Montreal, QC, Canada. 01/28/11."
Two covers were done for this issue; one featuring Superman and Wonder Woman, and this alternate one featuring many Supermen flying in orbit (10 issues for 1 issue mixture).
Story continued from the previous issue, and continues in the next issue.
This is not a co-writer situation, Roberson is working from Straczynski's plots; they gave him a rough outline that JMS had turned in for the remaining issues of the Grounded arc, which amounted to a sentence or two for each of the issues, spelling out in general terms where the issue would take place geographically, specific guest stars, etc.
The Wonder Woman here is the same version that is concurrently running in JMS's Wonder Woman title. As such, Superman (and the world) does not recognize her, and she only thinks of herself as a warrior defending Amazons, and not as a superhero (although this adventure makes her wonder).
Preview of the cover and first five pages of Batman and Robin (DC, 2009 series) #20.
Letters from Marvin Choi, Leandro, Carl Bosnasera, and Chad Whitley; with answers by Ian Sattler. Appears on page 33 in this issue.
Promo for the DC Universe Online game with a "frightening look" (preview) at dcuniverseonline.com/cinematic. Appears on page 34 in this issue.
House ads for: Brightest Day collector action figures, Batman: The Return of Bruce Wayne hardcover, The Flash: The Dastardly Death of the Rogues hardcover, and Justice League Generation Lost #19. Appear in various places in this issue.
Total of 3 one-page ads for: DC Universe Online Offical Strategy Guide (book, BradyGames), got milk? with Apolo Ohno (milk, America's Milk Processors), Kingdom Hearts: Re:coded (video game, Square Enix). Appear in various places in this issue.