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.
UNICODE-RANGEtoken (in Syntax & CSS2.1) to be more restrictive in what it accepts, per Tab’s proposal. (No changes to Fonts.)
font-variant: full-width. Revisit if fonts start to become popular that would benefit from this extra interaction.