I went out on it last night. I was on a fat bike, but there were tracks ahead of me from normal mtb tires. Trail is great to the parking lot cut-off at the end of chert dip. As others have said, it is probably faster, and definitely easier riding than the summer trail.
I rode CD to the start of Holy Schist, but it is pretty soft after the cut-off. Once you get to the start of HS, it is unrideable, and I don't think what trail was there was even the actual trail. I'm working on procuring some snowshoes and will go out to stomp it once I get them, if anyone is interested in joining/aiding in navigating.