I definitely think this is going to be the first real movie to show off the Tomorrow-verse Justice League all together (maybe so we get to see them as a team and as a group before Crisis) .I assume this will be the pay-off movie to the little end credit tease from Batman: The Long Halloween - Part Two. Superman (or anyone really) is trapped on War World and the League must be formed to save him from Mongul?
I know this reminds us all of the less than successful episode from Timm's Justice League, but at least Mongul is something a little different for these animated films.
And this like the first real Justice League animated film we've gotten since JLvsFF back in 2019 .Yeah, this seems like it will be the first big Justice League movie in the new "Tomorrow-Verse" continuity. Interesting they're using Mongul, it might seem an odd choice but it's kind of a refreshing change of pace from Darkseid (who will probably still show up eventually).