This version brings improvements and stabilization to the Extension Manager and Distribution Wizards. It also adds the ability to internationalize applications created with the App Within Minutes tool, and continues the improvements of the new experimental Solr search integration. This is the last release of the XWiki 4.x cycle.
Full release notes available at http://www.xwiki.org/xwiki/bin/view/ReleaseNotes/ReleaseNotesXWiki45
See http://jira.xwiki.org/secure/IssueNavigator.jspa?reset=true&jqlQuery=category+in+%28%22Top+Level+Projects%22%29+and+fixVersion+in+%28%22%34.%35%22%29+and+resolution+in+%28%22Fixed%22%29 for more details