I uploaded the Agora spec on dropbox[1] to
https://www.mediawiki.org/wiki/File:Agora_specs.pdf . I tried to put in
appropriate disclaimers and links, edit away.
I filed bug 54360 to implement new Agora spec in the mediawiki.ui CSS
module. Now that the LESS CSS preprocessor[2] is in core there's some
interest from various engineers. I work on it and a Special:Agora sample
page after hours, but it's slow going.
[1]
https://www.dropbox.com/s/wa9uayq9j09agyh/Agora%20specs.pdf , from
August 20.
[2]
http://lesscss.org/
Cheers,
--
=S Page Features engineer