See, having now watched the First Purge, the costumes, props, etc, are actually the biggest reason why I don't think it's coming, or at least that it won't be entirely based off of the new one. The entire climax of that movie revolves around people wearing blackface masks.
Holy crap. They better be careful with it, 'cause if they aren't, Universals would wish they only had to deal with the AHS: Asylum controversy.