So a buddy of mine and I rode Poto this morning. And based on the conditions we saw today and the weather forecast, it's likely to look the same for the next week!
The areas that have heavier foot traffic are slippery ice particularly the starting run out of the parking lot. We rode on regular 29" mountain bikes with no studded tires or anything. It was a challenge for sure, but we didn't spend the entire thing hiking-a-bike. We only hiked on the narrow downhill or uphills, but areas with some side buffer made it easier to skirt around the super slick icy spots.
The majority of the trail we found to be traction ice: that is, .. .. ice, but our regular tires held on as the ice had a layer of fused snow on top.
The upper portion (everything after the sand pit) was fantastic! Only a few hairy spots here and there, but by in large a lot less travelled and fairly smooth comparatively.
The loop back down to the parking lot from the shortcut merge was bumpy with hiking boot marks and at times super slick. The dirt roads were terrible! Avoid for sure.