Fans wanted old Modern Warfare 2 (2009) content to return in Call of Duty: Modern Warfare 2 (2022), so that's precisely what Activision is doing for Call of Duty: Modern Warfare 3 (2023).
A new multiplayer focused trailer came out today for Call of Duty: Modern Warfare 3. It's familiar yet new. Unless of course you never played the older Modern Warfare games before, in which case it's all new to you....