I’ve strayed completely from the New 52 Earth 2 things until this issue. Why? For it contains Damian Wayne. Do be warned of spoilers.
As some people have commented, the New 52 universe feels scarcely populated. DC’s strategy has been to focus on their handful of iconic characters from which they plan to spin-out stories that brush in the details of the universe. This strategy, while successful in many ways, has come to the detriment of many beloved Golden-age and legacy characters. James Robinson begins to rectify this with a new Earth 2. This universe, one of the new 52 universes, which is to be the home of Power Girl and Huntress (though, as their popularity would dictate, they were quickly jettisoned to the main DC Universes and their own series, World’s Finest, in the first issue of the Eponymous Earth 2 series) as well a new JSA. Or at least something that bears a semblance to what we have known as the JSA.
Traditionally the JSA were the first crop of super-heroes to appear, mostly around WWII, in the DC-verse. Publisher’s have always had an uneasy relationship with character origins that were historical situated, specifically the ageing issues that they inevitably lead to. Previously DC had utilized the Earth 2 concept as a way to explain away the discrepancies of such historical situated origins. As a result, Earth 2 stories have a pretty lengthy and developed publishing history. Those who were expecting a modern update of these stories will be severely disappointed. Earth 2 is as different from Pre-Crisis on Infinite Earths, or even Post-Infinite Crisis Earth 2 (which, although editors went out-of-the-way to make clear was not the same earth, was in fact a very clear homage) as imaginable. Whereas the JSA had been treated as the forbearer of the JLA for a while now, Earth 2 is re-imagining them as a group heroes who fill the vacuum left after the catastrophic destruction of the JLA.