If you want to load BETA (unstable) versions of SqueezeCenter you can. You just need to enable the Slimdevices YUM repo.
Warning: Installing BETA versions will break all kinds of stuff like VortexBox player.
First enable the repo. Enter this from the command line.
rpm -Uvh http://repos.slimdevices.com/yum/squeezecenter/squeezecenter-repo-1-4.noarch.rpm
Now you can use yum to update to newer versions of SC.
This will get you the latest production version.
yum update squeezecenter
This will get you the latest testing version
yum --enablerepo=squeezecenter-testing update squeezecenter
and this will get you the nightlly build
yum --enablerepo=squeezecenter-unstable update squeezecenter
If you no longer want to have access to BETA version you can un-install the BETA repo.
rpm -e squeezecenter-repo
rpm -del --nodeps squeezeboxserver
yum install squeezeboxserver