I imagine most of the web dev world hadn't realized that the display module of CSS3 was only in working draft status. There are some serious improvements and equally serious issues involved with this seemingly innocuous property.
I've taken the liberty of copying a letter to the whatwg and html5wg from the css3 wg. This is informative reading and well worth your time. Don't tl;dr the message.
Quote:
fantasai
Sep 27 (1 day ago)
to www-style, Boris, public-cssacc, whatwg, public-html, List, Daniel