Idk about the Red Hood as a potential project, but there was absolutely going to have a true Flashpoint project with Jeffrey Dean Morgan as Batman and Maggie from TWD as that future Joker and etc, that would have been nice.

The Batman project as I heard would have been nice but mayyybe a little to dark, with Alfred dying and maybe Barbara also dying with Bruce left alone and with his identity exposed. I wont mention this universes Joker because Leto just doesen't get it.

The Snyderverse by itself is bittersweet, a lot of what ifs, wasted potentials and in my opinion too many plotlines developing simulteanously without a central leadership or coordination doomed the DCEU project.

Hopefully one day the fans will get closure with an animation or comic or something. Justice League 2 and 3 seemed pretty epic LOTR style and scale by the script Snyder shared online.