My "must have" occults are Werewolves and Faeries. I just don't feel like Sims 4 will be complete without them. So if I had any say, I'd be releasing one of them come September/October (probably Werewolves though, since they seem to suit the fall season well.) And as much as I really want Superheroes, I don't feel they're as likely to come as other occults.
But honestly? At this point, I'd be up for genies, updated plant sims, or even zombies as far as occults go. I know we got Paranormal at the beginning of this year, but I'm really hoping they're secretly workin on some... literally any occult for a September/October release. Unless they choose to switch the schedule up and give us an occult lifestate in 2022? (Instead of waiting for 2023.) It's been 2 years since we last got a new occult LIFE STATE and I think it's well past due time for another.