I just installed the 11-15 WIP and opened a file saved from an October WIP which had an artistic view with a clipping plane. It opened with a completely black background, but when I clicked around trying other view types and then went back to it the background was the same gray as a shaded view. The “disable clipping plane” command didn’t work, but when I deleted the clipping plane the artistic view went back to the old familiar appearance.
I also noticed that retraced (Cycles) view doesn’t clip with a clipping plane, although it does show the clipping plane intersection.