I really want Seasons too and all the spies thought it would be the next EP, so that leads me to think that when it does come it is going to be as super intensive as LN and our computers are going to come to a grinding halt.
I'm thinking this statement goes along the line of Pets. Remember the high demands of Pets, it comes out, and half the population's GPU's finally threw in the towel, as soon as it officially hit the shelves? I can agree that it will be very hard on one's specs. However, I believe it will be worked out, but as usual, those with onboard graphics, will experience major bugs, artifacts and possible distortions.
I think if Seasons were to happen, I will imagine, it will be as big as Generations: New Objects, life states, features, moodlets, traits, a new category for CAS (of course) but I don't see a new town coming with seasons. A new town would be too much for seasons to handle.
I'd like to see some sort of swimming SP. Something with different swimwear for all age groups, kiddie pools, and other water activities.