A preview video and a few new features have been announced this week (news here). The Sims 4 Create-a-Sim looks really slick and way less cumbersome than having a hundred sliders. In a perfect world, I would love a game that’s a blend between The Sims 2 and The Sims 3 as both games had various elements not present in the other. Here’s my wish list for The Sims 4:

• Hair customization: I can see why height is a huge point of contention for technical reasons relating to sim animations but, why can’t we have more hair customization? I would love for example, CAS sliders for hair length, bangs, curliness, etc (all factoring into genetics as well). Having a small handful of hairstyles makes everyone in the town look the same after a while.
• Actual businesses: Less rabbit holes, specifically, the ability to run businesses ala The Sims 2: Open For Business. I am really surprised that this feature hasn’t yet been added into TS3 via an expansion pack…
• More distinct personalities: The Sims 2’s trait system helped a little bit in terms of actually adding personality but sims as a whole still behave pretty similarly. I would love to have dynamic traits and habits that develop over time as well as the ability to set relationship related goals (perhaps a CAS option) instead of relegating that to traits. Have these goals factor into the AI behavior. The AI should actively seek to fulfill goals
• Better town customization tools/more flexible neighborhoods: After 5 or so expansion packs, older neighborhoods start getting a little crowded after adding in all of the new lot types. I like playing only one or two neighborhoods; It’s fun expanding them, adding families, and watching the town grow. It would be nice to have the ability to build and modify neighborhoods extensively within the game client instead of having to load a separate tool. It would also be nice to be as to expand existing neighborhoods with new regions (like adding a downtown area TS2 style without the loading screens).
• Better family trees: At minimum it would be nice to enlarge the window to viewable families. Ideally, I would like to be able to export Gedcom files as well as click on portraits to view information, memories, and sim statistics.
• Apartments a la TS2: Apartments that aren’t just glorified rabbit holes. The apartment buildings obviously, should have the ability to hold multiple households. Individual apartments should be able to hold multiple households via a roommate system.
• Per household/per sim story profession options: It sounds kind of sad, but I want the ability to shove a dozen sims in an apartment complex and not have them move around or do anything. I also want the option to keep certain lots “in the family.”
• Sim hot-switching: I want to be able to click on a household and start playing it without having to load the town editor etc etc. The one playable household per neighborhood design doesn’t work all that well for my style of play.
• Better pathing…
• Seamless aging 

I know this one will never happen but: More features added into the base game. We almost literally have the same expansion packs being released for each game…