Just returned from spending the weekend at Alpine Creek Lodge (denalihunter's place) at MP68
The road is still driveable, however there is enough snow on the shoulders to keep a sled running cool. It's pretty thin for the first two miles after the parking lot but the snow gets better as you continue eastward. Not really riding snow but if you wanted to hunt bunnies close to the road or run the established trails you don't have to worry about overheating or smoking a hyfax.
As far as critters...I saw 3 big wolves near the 12 mile turnout Saturday eve and was surprised to see them so close to Cantwell. I also saw a big lynx between Seattle Creek and Brushkana, Caribou east of Brushkana and again near Susitna Lodge. I cut a lot of bunny, fox and lynx tracks east of the bridge.
BTW the Big Su at the bridge is frozen up nicely as far as you can see in both directions and if you drive it be aware that there's some overflow on the road about halfway up the hill east of where the road runs along the Nenana River (about MP 116.5)