There’s going to be a JSA book set on Earth-2 at some point in the near future. (Miniseries, I believe. Most of the announced post-launch books are.)
The New Gods are fairly prominent in the relaunch - they feature in the first arc of JLA (we see what appears to be a new kind of Paradaemon planting a motherbox), and Mokkari is the major villain in issue 1 of OMAC (probably continues to be so). Also, the creature the JLI are fighting come the end of issue 1 is VERY Kirby. Don’t recognize it, but I’d be surprised if they just built something Kirby-ish without a plan to tie it to one of the Kirby-created properties, so likely it’s either not new, or it’s got ties to OMAC or the New Gods.