UC is currently on hold for several reasons, most important is that is awaiting for the official integration of B-Mesh project and some other sculpt improvements, as I have explained several times before the current mesh system in Blender does not allow real time incremental updates, and while prototypes of UC can be implemented performance will be terrible slow after several thousands of polygons. Of course, an intermediate data structure can be used but that would mean another computation layer that may not be worth to have once Bmesh enter the scene. The good news is that If I’m not mistaken Bmesh is closer and closer so I will soon set the foundations of UC in Blender 
Cheers
Farsthary
) smoothing and relaxation tool that takes fully advantage of subcells : FastSmooth
