Tiki has released updates for both current release branches: 3.5 and 4.2. Both updates include bug fixes, feature polishing, and security updates. 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.