It's hard to say what you would want specifically; everything gets added to the language because someone wants it, and I can't read your mind. The main new features for each release are promoted on the release pages for the x.y.0 versions:
And documented in more detail on the "What's New in Python" documentation page (a table of contents for version-specific pages; but I think at one point in history the info about every version was just in-line in a single document):