A super natural EP would be pretty cool, although I would expect less life states introduced than in the sims 3, maybe like 3 new life states in Sims 4 as oppose to 3's 5 new life states (vampires, witches, werewolf's, fairies, and zombies). I think it would be pretty cool to get fairies and witches back, werewolf's were just kind of meh in sims 3, might just be my opinion, but ya witches and fairies have a lot of potential for this perk system vampires now use, and maybe each life state can get their own themed world, similar to forgotten hallow but of course reminiscent to the life state it belongs to. OH! And maybe some super natural careers! Maybe even playable careers? Or semi playable careers like in City Living? I think exclusive careers for super naturals would be pretty cool.