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.
flex-wrap: wrap | nowrap
in place of flex-lines: single | multiple
.display-inside
and display-outside
split of display
property.disabled
attribute for style sheet linksTantek created a wiki page to track issues.