Kits: about two dozen items (Counters and kitchen cabinets count as 6-7 each because they have so many different shapes) of either the CAS or BB variety around a theme or style that may or may not coordinate or expand on themes/styles we already have. I prefer areas where the current game is thin, such as the underwear/sleepewar kit and the upcoming Goth and Medieval kits.
And yes, kits have roughly 24 items each (allowing for the cabinet proviso above). I've counted. The only exception is Bust the Dust, and I'll give that one a pass as it adds a whole gameplay system that I do not want in my games.
Stuff Packs: A decent spread of CAS and BB items, maybe some traits or aspirations, a few minor gameplay additions and one major gameplay addition, usually tied to an object of some type. All based around a central concept and related style.
Game packs: A central gameplay concept that may not appeal to all players and systems supporting that concept, CAS and BB supporting that concept, and maybe (hopefully) a small world with 5+ lots that is also tied to that concept. Some new gameplay may be limited to that world, while some regular world Gameplay may be limited in that world.
Expansion Packs: A major gameplay expansion which may or may not expand to all worlds, and several moderate and minor gameplay additions which are applicable - or at least usable - in all worlds. A new world of at least 12 to 15 lots - though depending on the concept, this isn't strictly required (Seasons gets a pass). CAS and BB supporting building locations and creating sims for that new world. Also a coordinating Base Game Update which may include adding features required to use the pack in all worlds.
Now, do I like it when gameplay is limited to a given world? No. But in some cases, I can understand why (Mountain events limited to Mt Komorebi, for example)
