Well, its own Earth. Which is weird, since the current Superman is supposedly old Supes + New 52 Supes, but I guess Doom Cock #12 changes it again... so it's just old pre-New 52 Supes? And New 52 Supes has been separated out into its own universe?
John's plans for the future are fucking crazy, Secret Crisis.

Would be awesome to see but there's no way they're keeping these dates.