So here is the latest.
There are still some differences in the models and still enough time for changes, but the latest trend has been to shift the band of heaviest snow south some. Areas currently indicated to see the heaviest totals would be north central and northeast WI, the eastern 2/3rds of the UP and far northern lower MI. Totals in excess of 12" look to be a very high likelihood, with the potential for double that in spots. A general 8-12" would fall across most of SD, the southern 1/2 of MN into most of the rest of WI, with the exceptions of the far south, which would see just a few inches. The western 1/3rd of the UP would also be included in the 8-12" totals range. Within the area of 8-12" just mentioned, some 12"+ totals would also be possible.
An important feature to this system will be it's slow movement. We are all accustomed to a storm lasting 12-18 hours in most cases. This one will spread it's first snows into the upper Midwest as early as the wee morning hours of Friday, with things really getting going in the S. UP and N. WI on Friday. Saturday may see a bit of a lull for most areas, with heavy snows in NE WI and south central MN and then another round of heavy snow looks to impact most of WI, the UP and northern lower MI Sunday, with LES to add a few inches to the UP snow belts Monday.
-John