I went out for a short snow ride this morning. The mountain bike handled just fine on the snowy streets. Of course, I was using techniques I've used in previous winters of snow riding: going slow, taking turns wide, braking slowly, and doing more to be visible to drivers, who usually aren't looking out for bikes in this weather. It was a pleasant ride.
Between 95th & 99th, I didn't see much clean pavement except on Leavitt (haven't been down to Longwood yet). North of 95th, a bunch of streets were cleared, and the plows were still making the rounds. Of course Ginger Rugai can have clear streets up by her house, but the rest of us can just slide around. This may be a loooong winter.