Just watched Justice League Dark Apokolips(pretty solid film) but the main point is following DC films track record of dark and gritty from Flashpoint, I think it is very possible for NRS to be able to make INJ3 or the next DC related work rated M. Literally dismemberment, neck snappin,and headshots were all present at some point in these films(to and by villains and heroes alike). NRS has reused animations from Injustice 1,2, MKX and MK11 so building character's movesets from existing bases wouldn't be surprising. For characters not introduced yet in the universe , Young Justice did a good job revamping Sportmaster(literally a dude who was beating the OG Green Lanterns ass with a wooden bat is now a hulkin Mercenary) and Captain Boomerang I can imagine being a Kano/Jade hybrid. Just saying watch a clip of the movie.
There's enough characters that fit the "will kill my enemy" bill and there's so much to explore with actual comic integrations and overall fresh ideas that can link the story together,tbh they can just redo Flashpoint or Apokolips

What do you guys think?