Since they put "realm" into the title I expect a new world about the size of Forgotten Hollow. Maybe an aspiration that lets sims unlock magic powers while experiencing a short storyline in that world.
Also the use of "magic", not "witches", gives me hope for something more versatile, a generic magic user base that we can customize into our own traditions.
I think we will be able to create supernatural sims in CAS and I also think it would be neat if they differentiated between sims born with a gift for magic and those initiated into it as a science. Something like sorcerers and wizards and Dungeons & Dragons 3rd edition (didn't play 4th or 5th, so I don't know if they kept that). For example anybody can get initiated and learn the magic skill, but there is also a trait for natural mages that gives them a few inborn powers regardless of whether they decide to train in magic or not.
