"in his story, the two Supermen will co-exist" suggests to me that the two Supermen will co-exist in the new comic 

The next paragraph:
<<”That being said," Jurgens continued," they find themselves thrown headlong into a story where Doomsday has been released in Metropolis, and as this Superman goes to fight him, Clark Kent is there with no explanation whatsoever. The mystery is going to be, 'How could this possible be happening?' Right from the get-go, we’ve got two very different characters. We have Superman, and we have Clark Kent, and no one can understand how that’s possible.”>>


The next paragraph:
<<”That being said," Jurgens continued," they find themselves thrown headlong into a story where Doomsday has been released in Metropolis, and as this Superman goes to fight him, Clark Kent is there with no explanation whatsoever. The mystery is going to be, 'How could this possible be happening?' Right from the get-go, we’ve got two very different characters. We have Superman, and we have Clark Kent, and no one can understand how that’s possible.”>>