[Expanding my comment from another post on this¹]
Direct links to the PEPs themselves, to perhaps save others a little time. Although the LWN write up linked in TFA is a very nice introduction to the topic and its big discussion in the community.
Accepted:
Specification https://www.python.org/dev/peps/pep-0634/
Motivation and Rationale https://www.python.org/dev/peps/pep-0635/
Tutorial https://www.python.org/dev/peps/pep-0636/
Rejected:
Unused variable syntax https://www.python.org/dev/peps/pep-0640/
Explicit Pattern Syntax for Structural Pattern Matching https://www.python.org/dev/peps/pep-0642/