I feel (and honestly, i doubt that i will be wrong on this one, but i would love to) that this will be a, if not generic, random mob movie that just happens to have characters named after DC characters. It makes ZERO sense to make a Joker standalone movie, even less without Batman, and even less a origin story, is just one of the most non sensical movie projects i have ever seen. It might be good, but i doubt it will have anything to do with anything Joker related.