I definitely think itll be Witches with medieval tone world!
I do hope they work Witches with Vampire style ski tree, love it. And give them plenty of new fun spells and interactions and new animations! I'd love to make old style witches, modern ones, new age, Harry Potter like, and many more. I do hope for Elemental type magic, where let's say a skill tree divides into 4 elements (earth, wind, fire, water) and you get a choice to have one or all and have unique spells to unique element. Water - summon rain, shower, water plants, drench sims, freeze, etc. You get the idea.
I do want to see unique fun spells! Spells like increase flirty mood or make happy are great but so boring, we need something fun! Like turn sim into a llama, or frog like classic, or make them burp up coins, or make telekinesis type spells where furniture and TV dance and dishes clean themselves with broom dancing and sweeping the floors! Surprize me, I need this creativity to spells.
World wise, yes medieval would be best. I want to make a Wizard locked in a tower, have secret bookcase door, spiral staircase, walk with lit candleholder, dusty tones with ancient spells.
A broom that let's you fly around current neighborhood, like vamp speed run style or bat fly style.
Unique magical pets! Gryphon? Fire salamander? How about alipaca - a unicorn pegasus alpaca (like the toy for kids) but full sized magical pet? Would be fun!
Dragons, of course! I definitely miss those silly bums. Except the boi that set everything on fire and killed entire family in Sims 1. I'd love it.
New cauldron potion alchemy skill, new unique spell ingredients! Sims 1 style spell creation - get mermaid scales, dragon breath, and plantsim petals to create some funky potion! So many possibilities. Can even do "steal voice" potion Disney style and the victim cannot talk to other sims and instead waves and points at throat apologetically, for like 5 hours. Or curses, like curse sim to need to pee constantly or give them snake tongue and eyes and suddenly they run to fridge to eat meat, lots of it! Or give bunny ears and teeth and they run to eat salad and carrots!
So many ideas. I do hope the Sims team will thoroughly make it and release the pack complete and fun for the long waiting fans of Witches like me and so many others.