It would be great if we can have a Steampunk inspired pack, or else, please give us the Happy Haunts with the underworld theme. A life simulation game should encourage us to live with an expectation to question ourselves about, "what if" and being creative. I will welcome anything that is interesting, unique, new & engaging.
More than that, I hope that they could overhaul the Sims personality, gradual ageing, improve the terrain & stair tools, give us a water tool, a round shape wall, or give us an option to colour the ceiling & many more. Basically, what we need is more option than just playing with things that limiting our imagination. The team needs to work even harder than before, because they need to retain the existing consumers instead of just expanding their target group.
