I'm surprised there isn't any threads on this at the moment, but they've announced the second expansion of the year in mid-October for the past three years so I'm hoping we'll see something of the nex...
The Banana Republic Kit. We'll be given a clothing style from the Caribbean.
Also, Generations isn't happening because most of the things that were in Sims 3 Generations have been put in Sims 4 by now - not in one pack, but scattered around. What's left over isn't really sufficient for a single Expansion.
What's horribly missing is a distinct lack of Occult development, despite the desire for it.