Eh? KDE is nothing like Windows 3.11, not even remotely. I'm assuming by 'completely new design' you mean the Unity interface used by Ubuntu? Or Gnome 3 (which seems to be drawing much hate). Gnome 1 was pretty similar in layout to KDE 1/2 - even Gnome 2 was similar in that way if I recall correctly, never really used Gnome much.