Superman returns to Earth in September to kick off a "new era"

gamesradar.com:

Superman Returns!

In the pages of Action Comics, that is.

While Superman is trapped on a dream-like prison planet in the pages of Dark Crisis in the immediate future of DC continuity, in current continuity in the pages of Action Comics he's been off-planet battling Mongul in the 'Warwold Saga' by writer Phillip Kennedy Johnson for some time now. 

But Kal-El finally returns to Earth and Metropolis in September, setting up a crossover storyline with Metropolis' other Superman - his son Jon - through November.

But first things first: Superman: Warworld Apocalypse #1, a 56-page one-shot by Johnson and artists Brandon Peterson and Will Conrad, wraps up the extended storyline on August 30 and features the final battle between Superman and Mongul, and between the Authority and Mongul's Unmade Champions.

The story arc's finale (in which "empires fall and rise and the fourth world is reborn") also features the reveal of the hooded stranger haunting the storyline, which according to DC uncovers a "shocking betrayal" that threatens to crush Superman’s rebellion. And the key to Superman getting his powers back (which we think is likely) lies with Natasha and John Henry Irons.

"Superman: Warworld Apocalypse is everything we’ve been building to with the Warworld Saga, with the final battle between Superman and Mongul, between the Authority and the Unmade, and the long-awaited reveal of the real mastermind in the shadows," says Johnson of the special. "There are some frankly shocking moments in this issue, and some huge reveals that will have long-lasting repercussions in the DC Universe."

Following the special, Superman will then return to Earth in 'Kal-El Returns,' a six-part crossover storyline between Johnson's Action Comics