Fedora Core is RedHat supported by it is now a cumunity project. This means that software that makes part of the distribuition is voted by a community and not RedHat.
So, KDE is well supported under Fedora.
Kopete works fine under Fedora. There are even KDE3.2 packages for Fedora that include Kopete 0.8 beta or so (works fine). Nevertheless, KDE3.2 packages have the artwork a little messed up.
Fedora is now an alternative for KDE users although I am looking to change :-).