For anyone who’s interested, the KDE group publishes their latest versions in Yum-compatible format. This means that you can get automatic updates for KDE better than what Red Hat, Fedora, Suse, whatever provides. Just create the file /etc/yum.repos.d/kde.repo, with the contents:
# kde-redhat.repo, v1.0
#
[kde-redhat-stable]
name=kde-redhat-stable
mirrorlist=http://apt.kde-redhat.org/apt/kde-redhat/fedora/$releasever/$basearch/stable/mirrors
gpgcheck=1
gpgkey=http://apt.kde-redhat.org/apt/kde-redhat/kde-redhat.RPM-GPG-KEY
enabled=1
#
[kde-redhat-stable-all]
name=kde-redhat-stable-all
mirrorlist=http://apt.kde-redhat.org/apt/kde-redhat/all/stable/mirrors
gpgcheck=1
gpgkey=http://apt.kde-redhat.org/apt/kde-redhat/kde-redhat.RPM-GPG-KEY
enabled=1
#
# NOTE: enable/disable *both* testing/testing-all together; requires/depends-on stable
[kde-redhat-testing]
name=kde-redhat-testing
mirrorlist=http://apt.kde-redhat.org/apt/kde-redhat/fedora/$releasever/$basearch/testing/mirrors
gpgcheck=1
gpgkey=http://apt.kde-redhat.org/apt/kde-redhat/kde-redhat.RPM-GPG-KEY
enabled=0
#
[kde-redhat-testing-all]
name=kde-redhat-testing-all
mirrorlist=http://apt.kde-redhat.org/apt/kde-redhat/all/testing/mirrors
gpgcheck=1
gpgkey=http://apt.kde-redhat.org/apt/kde-redhat/kde-redhat.RPM-GPG-KEY
enabled=0
#
# NOTE: enable/disable *both* unstable,unstable-all [...]