This is a page from the Cascading Style Sheets Working Group Blog. Some other places to find information are the “current work” page, the www-style mailing list, the Future of CSS syndicator, and the issue list on Github.
Do you want to know how the CSS WG works? Fantasai has written about:csswg, An Inside View of the CSS Working Group at W3C.
font-stretch was originally excluded from font shorthand because the shorthand syntax was very fragile and editors were concerned about adding anything to it. John Daggett to look into whether it’s still a problem, and see if it can be added.local() being underdefined, seem to have agreement on copying quoting conventions of font-family property.font-kerning property to have three values:
autonormalnone