I honestly don't mind if seasons comes with a new world or not, as long as its fleshed out. But if it does come with a new world then I hope its winter themed. Worlds would still all be affected by se...
I would prefer no world and more detailed seasons. Weather would change the feel of all the current worlds anyway making them kind of feel new again in a way. Thats what it felt like for me with the sims 3.