Since the release of Joomla 1.6, back in January 2011, Joomla started to use a new development strategy.
The development strategy is explained in a long article on http://developer.joomla.org/strategy.html, not always understandble for the international Joomla Community. The actual development status including release and End of Life dates is listed on http://developer.joomla.org/development-status.html
In an attempt to make the new development strategy more understandable for the wider Joomla Community, I have created the Joomla CMS Development Strategy Infographic.
The Joomla CMS Development Strategy Infograhic is also available in: Dutch, French, German and Spanish.