From official news Joomla1.0.14RC1:
The Joomla! Project today announced the immediate release of Joomla! 1.0.14 RC1 [Daybreak], the first and hopefully singular release candidate for the 1.0.14 release cycle.
Joomla is an open source CMS started by former core developers of the CMS Mambo. The 1.0.x tree of Joomla was forked directly from Mambo. Work has been underway on a massive overhaul of the system, Joomla 1.5, which finally does away with nested tables, which should lighten things a bit. The changes in Joomla 1.5 are too numerous to list; it’s just about a whole new CMS altogether. Joomla 1.5 is currently on the fourth release candidate, and the release version is expected before the end of February.