The Python Steering Council has now formally accepted PEP 703 ("Making the Global Interpreter Lock Optional in CPython"):
"In short, the SC accepts PEP 703, but with clear provisio: that the rollout be gradual and break as little as possible, and that we can roll back any changes that turn out to be too disruptive – which includes potentially rolling back all of PEP 703 entirely if necessary (however unlikely or undesirable we expect that to be)."