> > But we should make some noise around this change in the 3.7 announcement.
>
> How about a paragraph in the Deprecation section of the "What's New in Python 3.7"? document
>
> https://docs.python.org/dev/whatsnew/3.7.html#deprecated

You mean other than what's there? The text that's currently there begins with "In Python 3.8, ..." which almost sounds like it's misplaced or a typo.  Maybe you can amend it somehow to explain that in 3.7, using or importing the ABCs from "collections" instead of from "collections.abc" is deprecated, and in 3.8 it will stop working.