Since we have two competing proposals for the Steering Council to consider when it comes to the target release date for Python 3.9.0, Steve, Łukasz and I put together a short-ish overview of the common set of problems that the two PEPs are both attempting to address, as well as the common risks that they're attempting to mitigate.
If folks have questions or suggestions regarding the specific proposals, those discussion threads can be found on Discourse here:
PEP 602 (12 month release cadence): https://discuss.python.org/t/pep-602-annual-release-cycle-for-python/2296 PEP 605 (24 month traditional release cadence with a rolling pre-release stream): https://discuss.python.org/t/pep-605-a-rolling-feature-release-stream-for-cp...
There's also a thread for the new overview PEP: https://discuss.python.org/t/pep-607-shared-background-for-the-release-caden...
I expect most comments will be best targeted at the threads for the specific proposals, but the PEP 607 thread should still be useful if folks have questions or comments about the overview PEP itself.