Did The Apocalypse War Happen In IDW\'s Dredd Reboot? Only You Can Decide
At Long Beach Comic Con, IDW also talked about the new Dredd comic they're publishing - out how it works in continuity.
While describing it as "sonething of a reboot", they state that Dredd is five years out of the academy so it doesn't interfere with current canon. Each issue will have backup stories that set up a larger story. And that Mega City Two exists - but they will let the readers decide if the Apocalypse War happens... or not.
The classic 2000AD Judge Dredd arc saw Mega City One invaded by the Soviet East Meg One, halving the city's population to only four hundred million.
I'm not sure at what age Judges graduate but IIRC there was an early story with Dredd's date of birth on a grave stone or something which indicated he was in his early thirties. As the stories seem to happen in real time then the Apocalypse War is some way off.