As you all can see in the #Slackware-current ChangeLog.txt, Slackware now can support #GNOME 3.8 out of the box although you still have to install PAM to be able building GDM which is a requirement for gnome-shell. But as I say before, and I have tried it my self, we can build our own GNOME 3.8 on top of Slackware-current with only two non-crucial package being rebuilt. Here is my GNOME 3.8.3 in action:
