I don't think Horizon and Fable will launch in the same year, Playground will want to spread them apart, they may be two different teams but they'll still be some overlap among developers, marketing and Ralph Fulton is the Creative Director of both, I suspect they'll also want to spread their revenue more evenly, launching one AAA for a company is a pain, launching two in the same year sounds like a nightmare.
I think Motorsport in 2021, Horizon in 2022, Fable in 2023.
Idk. If ith games are pretty much done in either 2022 or 2023 I doubt they'll just wait a year. Developers love to let people play what they've created.