Tiki has released updates for both current release branches: 3.5 and 4.2. Both updates include bug fixes, feature polishing, and security updates1 . All Tiki sites are strongly encouraged to update to the latest version to take advantage of security fixes and updates. See http://tikiwiki.org/download to determine which branch (3.x or 4.x) best suits your needs.
Coming Soon: Tiki 5
The next major release, Tiki 5, is planned for April 2010 and will include many new features including shopping cart and payment support, improved translation/multilingual support, an advanced rating and scoring system, workspaces, performance improvements, and much more. See http://doc.tikiwiki.org/Tiki5 for additional information on this upcoming release. Early adopters can obtain pre-release versions of Tiki 5 directly from the SVN repository. http://dev.tikiwiki.org/Daily+Build
TikiWiki CMS/Groupware is a full-featured, web-based, multilingual (35+ languages), tightly integrated, all-in-one Wiki+CMS+Groupware, Free Source Software (GNU/LGPL), using PHP, MySQL, Zend Framework, jQuery and Smarty. Actively developed by a very large international community, Tiki can be used to create all kinds of Web applications, sites, portals, knowledge bases, intranets, and extranets. For more information, visit http://tikiwiki.org.