November 2013's php[architect] magazine mentions Joomla in the article "Interoperability: The Future of PHP" (http://www.phparch.com/magazine/2013-2/november/).
This article tells the history of the PHP Framework Interoperability Group.
It's an easy reading article.
Are you able to obtain permission to reproduce it and post on framework.joomla.org? It's terrific context.
Great job getting on board with PHP-FIG.