For some reasons, despite how I set up my pre-order with Amazon, they didn't want to send it to me until next week. So I cancelled and just picked it up at Best Buy.
Slow dancing is adorable! Sims can even accidentally step on their partner's foot.
I played a bit with the weather totem pole, and in the summer, you can do a revitalizing shower that rains flowers all over the city (even in map view).
Based on my sole single non-experimental experiment
if you change the season setting midgame, it still takes about 2 sim days to actually switch (I first started with all of the seasons, then turned off summer, and was still told it'd be another 2 days before fall).