You know what I just thought of, I think the next Stuff Pack after MS should be 100% about children and toddlers. No new lots or objects for teens or older, including CAS options. It should be called Nursery or Playtime Stuff Pack.
It should have the following:
-Different varity of cribs, potty chairs, high chairs, strollers, prams etc.
-New Toys, not just a play table, or toy boxes.
-New Playground equipment (Merry Go Round, Monkey Bars etc.)
-New and more gender specific only CAS options for children and toddlers. No Unisex hair and clothes.
-One or two new interactions
I would really like Seasons though, but I don't want it exactly the same way it was in Sims 2. I want it upgraded. I do believe Seasons can and will be done, but I don't think it will be as big as pets is. I have a feeling Pets will be the Biggest Expansion Pack in Sims 3. I bet Seasons will have it's upgrades, but the EP itself will be much smaller than expected. More playground equipment.
For upgrades I want:
-Summer: No school for children and teens, more pool objects, kiddie pools for children and toddlers, sports, BBQ parties, pool parties, Recipes relevant to BBQ cooking. Sunburns/tans, water balloon fights, skating rinks, etc. No curfew for teens and children get to stay out an extra hour. Squirt guns too!
-Spring: Flowers, can be picked for your significant other, children giving flowers, teens get random opportunity to go on spring break if they have good grades.
-Fall: Jumping in leaves, for children and childish teens and older, bonfires, back to school
-Winter: New lifestate: Snowman, Childish Sims will want to make snowmen, start snowball fights etc, so will children. Snow days, and positive moodlet for children and adults, except for workaholics. Can build forts and igloos. Ice fishing.