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.
order
affects painting order.
background-attachment: fixed
; in transformed elements; vendors to investigate their implementations.
recto
/verso
values to (page-)break-before/after in CSS3 Fragmentation.