Hi, here you have a first draft about MediaWiki Groups, and implicitly MediaWiki reps:
http://www.mediawiki.org/wiki/User:Qgil/MediaWiki_groups
MediaWiki groups organize open source community activities within the scope of specific topics and geographical areas. They extend the capacity of the Wikimedia Foundation in events, training, promotion and other technical activities benefiting Wikipedia, the Wikimedia movement and the MediaWiki software.
Imagine MediaWiki Germany Group, MediaWiki Lua Group...
These groups may become a significant source of growth and wider diversity of our community.
Please bring your ideas to the discussion page - or here. Thank you!