I'd like to move forward with publishing the flexible box model as a working draft. There have been specs floating around for years, but it's never been published on the TR page (despite, I believe, a minuted group resolution to do so at one point).

I think the newest draft is http://xulplanet.com/ndeakin/xul/specs/flexbox.html . (There's also an older draft at http://www.damowmow.com/temp/csswg/old/ui/flexbox.html .)

I propose we use the shortname css-flexbox; I'm willing to import it into dev.w3.org space and prepare it for publication if needed.

There's a good bit more technical work needed in writing up the details of the layout algorithm in mathematical form (and also in adding more examples, or readding dropped ones from the older spec). However, I don't think that prevents us from publishing it as a working draft so that we can get wider feedback on the material we have so far.