At least two more years for TS4 content! Let's predict the 2023 line up!

The big stuff:

BG update - freed babies (confirmed)
GP that's baby/infant themed
EP - Medieval with Horses. This is what I'd want. Medieval or Horses alone could be a GP, but let's combine them together to get a full EP.
GP - either Hotels or Hobbies. Depending on how deep they want to go with either, they could possibly be a GP. If they're too deep though, I could see it being EPs for down the road.