Today, I followed the instructions at https://help.ubuntu.com/community/SaucyUpgrades (Ubuntu Desktops 13.04 to 13.10). When I got to step #6, the release notes popped up, and the first two lines said:
Welcome to the Ubuntu 'Saucy Salamander' development release
This is still a BETA release. Do not install it on production machines.
Is my system trying to get outdated files, or is is safe to ignore those notes?