In order to install KDE 4.9 do as follow:
open a terminal and type :
su -c 'wget -P /etc/yum.repos.d/ http://apt.kde-redhat.org/apt/kde-redhat/fedora/kde.repo'
edit as root the file /etc/yum.repos.d/kde.repo
and enable the testing and unstable repository setting enabled=1, save the file.
Now you can upgrade to KDE 4.9 with:
yum update
