Koliko vidim nema nekih bitnijih promjena.
'Ocel ikada osvanuti taj satble release ove 1.5-ce

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Known Issues
* There is an issue with the URL rewriting plugin that affects links embedded in articles in some cases. Make sure you test this thoroughly before updating a live site.
Security Fixes
* SECURITY [HIGH] Critical CSRF allow portal compromise - Administrator components.
* SECURITY [HIGH] Fixed registered user privilege escalation vulnerability.
* SECURITY [MEDIUM] Fixed administrators can promote other users to administrator group.
* SECURITY [LOW] XSS vulnerability in com_poll
Upgrading
Although a complete re-installation is recommended, it is possible to upgrade from RC3 to RC4 with the following procedure:
* Backup all files; backup your database.
* Delete all Joomla! core files, but leave any third-party extension files in place, including your configuration.php file.
* Upload/copy contents of RC4 package.
* Execute the MySQL commands to be found in /installation/sql/mysql/diff.sql to implement the necessary database changes.
* Delete the entire /installation directory.