I feel as if EA is messing with us right now. I mean take a look at this:
Look at the category, and you will see the rain outfit. The Sims 2: Seasons hate outerwear which you can wear when it is snowing/raining. The Rain outfit has to deal with the same thing.
I also found this tweet from SimGuruMeatballs a little bit weird.
I think that it may be a hint saying seasons is coming out soon.