1. More tattoos (Saints Row 2 really spoiled me for this. Considering how personal tattoos are supposed to be, I'm always surprised when character customisation doesn't have more of them)
2. A way to confront Sims when they're being rude, sick of not being able to tell NPCs "what the hell?" when they shout at my dog for no reason, or come over to my house and dump all my rubbish from the bin onto the floor.
3. A Morroco-inspired vacation world, with middle-eastern architecture and markets/souks to go through.
4. A Lapland-inspired vacation world, with sled-rides, ice-sculpting and reindeers you can pet.
5. More items you can use off-the-grid, where it makes sense to be able to have those items alongside the electronic versions - like a teapot alongside the tea-maker, and a typewriter for authors along with a computer.
And honourable mentions to more additions to the collectible sets. I don't want the game to be all collectibles, but having a few additions (not just new sets) with every new world does make it feel more like a place to me. I was really surprised we didn't get at least a new plant or fish with Snowy Escape - plum soda but no plums? - but it's possible they're saving that for a later Farming expansion, or Cooking DLC. Also just new books. I'm sick of my bookworm Sims running out of new things to read. A new novel added to the bookshelf - not just the skill books - with every new pack doesn't seem that extravagant to me.