An image is worth a thousand words :
Left, Photoshop CC, right Photoshop Cs6.
In both versions, I can hide the result of a vector mask by shift-clicking on the mask's thumbnail in the layers panel (big red cross).
in Cs6, i then saw the path (italic "vector path of layer 0") and could edit that.
in CC, when a mask's result is not shown, i don't see its path in the path panel, and can't edit that.
Workaround : use the properties panel and set the mask opacity to less than 100%, but it requires 2 clicks...