Python 3.9.0 is almost ready. This release, 3.9.0rc1, is the penultimate release preview. You can get it here: https://www.python.org/downloads/release/python-390rc1/
Entering the release candidate phase, only reviewed code changes which are clear bug fixes are allowed between this release candidate and the final release. The second candidate and the last planned release preview is currently planned for 2020-09-14.
Please keep in mind that this is a preview release and its use is not recommended for production environments.