Welcome to Geeklog Friday, May 24 2013 @ 12:48 AM EDT
This version introduces new features such as a web frontend for creating RSS feeds, use of PEAR::Mail to send all emails (includes support for SMTP), various improvements in the Admin interface (rearrange blocks easily), Static Pages plugin 1.4, and more ... There have also been a lot of bugfixes as well as several attempts to further improve security.
Please note that this is not the final release yet (hence the name, "Release Candidate"). You are encouraged to try this version out, but you shouldn't really run it on a "live" site, unless you know what you're doing. Because of the huge amount of changes, there will probably another Release Candidate before the final release.
And now: Have fun!