XBMC 11 Eden RC1 has been released, this beta release comes 3 weeks after Beta3 release. According to the announcement, this release comes with a number of updated XBMC translations for final release, resolved a number of outstanding Airplay issues, allowed specified movie sets to be sorted by title, rather than year, without changing the default sort order on other sets and added a useful feature of IP weather look up.
For the complete change, check this link
Installation in Ubuntu and LinuxMint:
For Installation of XBMC 11 Eden RC1 in Ubuntu and LinuxMint, you need to use this unstable PPA:
sudo add-apt-repository ppa:team-xbmc/unstable sudo apt-get update sudo apt-get install xbmc
For other LinuxDistro, download the package from this link