This release adds an entirely new conditional logic system to Webform. With built-in support for same-page conditionals, multiple conditionals per component, and drastically improved user experience. See issuefor background.
Important: This release contains API-breaking changes. Modules that extend Webform may not work with this release. Be sure to back up your database and test your changes after upgrading. For more information, see the handbook page on Upgrading from Webform 3.x to 4.x.