I’m looking forward to this. It may not be obvious now, but I’m 100% positive this movie does not take place in the current DCEU, just like The Batman and Joker. No other explanation for a Justice Society when there’s an obvious Justice League.
However, I do expect to see it connect to the DCEU proper in the near future unlike the aforementioned The Batman and Joker.
I’m sure The Flash and all the universe hopping will help make all of this future consolidation make sense. It’s like they are moving toward creating a Crisis on Infinite Earths movie.