Mate they were working on the game but they couldn't get it greenlit in the end. There's been a bunch of leaked concept art of this game which stretches all the way back to 2015. This was leaked by a mocap/audio company called GameOn Audio who also worked on Arkham Origins (which was developed by WB Montreal...).Have there been any credible rumors about Superman from WB Montreal at all.
Around Oct 2018, Osama Dorias who's a senior game designer at WB Montreal mentioned that he got moved to a new secondary project which is a major DC property. We know for a fact that WB Montreal have been hiring for a UE4-based open world game seperate from the Court of Owls game
Connect the dots