At the moment, yes I do believe that most it is. Red Hat is a Gnome-centric organization. But I don’t think it will take long for the KDE-types to catch up, or any of the others for that matter.
Whatever code was not done for Gnome was done for ‘plumbing level’ software, as is suggested in the article. The Fedora feature page makes it a bit more clear.
http://fedoraproject.org/wiki/Features/ckremoval
===========We need smaller changes in: X11, gdm, CK, udev, dbus, plymouth, PK, NM, accountsservice==========
KDE and Gnome 3 are not on my Favorite list....at this time.