For those folks that are following this thread or read it later...
I drove about 50mi today with my dog to a local ski area to drive in the snow and let my dog play around a bit. I tested the vehicle quite a bit for about an hour of snow driving under different conditions. In the end I came away pretty amazed with what this little 4Matic can do.
1) I first tested this on the roads near the ski area and had zero issues. I was able to maintain the speed limit on compact snow/ice and didn't have any problems changing lanes.
2) I then transitioned to some of the back roads near the resort. These were still groomed and had sand. Again no issues whatsoever. I drove to a number of lift areas, turnouts and loose snow parking lots.
3) Next I went to some closed ski areas and traversed the roads, lots and turn outs. I found a loose pile of snow in a lot from one of the plows and wanted to do some testing. I hit one (expected) issue. In about 8" of loose snow I went too slow and lost forward momentum and had to reverse out and go a bit faster. Amazingly, driving in a bit more normal manner, I easily went through the snow. In the attached pic you can see to the left where the tire came to a stop and to the immediate left where I was able to drive through with a tad more speed. This test was to see how the vehicle would fare at low speed and deep snow. I recommend a bit more speed to push through. I can't speak to how it would do in long stretches of 8" snow but don't think I would try it without chains.
4) I then took the car off the main roads and up into the back areas where there are cabins. This area is not plowed regularly and has a little deeper snow. The car was, quite simply, amazing. I drove as far up the roads I could and never once had an issue. I even had to stop on an incline to let another car by and did not have any issues getting back my momentum from a stop.
For those that are interested theses were the stats.
Snoqualmie Pass: 102 base / 12" new
GLA: Stock tires (not Winter tires), off-road button on, DSR off