To me it's sounding like they'll announce The Sims 5. The Sims France said "What if we talked about the future of your favorite game?". The future of The Sims (The Sims 5), or the future of The Sims 4 (a groundbreaking expansion)?. Can a TS4 expansion ever be so good it warrants being called the future of the game and appearing in EA Play for the world to see? This is the usual time they announce a new base game, like they did with 2 and 3, 5 years in. Would I be mad if they announce it now? No. I'm very excited to see the next one like always, and to me TS4 only needs seasons to feel truly complete. (witches and university/education would be nice but not essential). I'm excited to see it live for myself. I hope it doesn't leak.
