With the release
of Python 3.9.0b1, the first of four planned betas for the development
cycle, Python 3.9 is now feature-complete. There is still plenty to
do in terms of testing and stabilization before the October final
release. The release announcement lists a half-dozen Python Enhancement
Proposals (PEPs) that were accepted for 3.9. We have looked at some
of those PEPs along the way; there are some updates on those. It seems
like a good time to fill in some of the gaps on what will be coming in Python 3.9

Source: LWN.net – [$] The PEPs of Python 3.9