I was in my local SC yesterday, Dec 2, and was told they had no word as yet. Spoke to two other MX owners and they were both curious as well. Not sure what the hold up could be since the MX's are stating to line up for their first annual service now.
On another note, I commented to the service staff about my 7week wait for an appointment. They mentioned that Tesla is gearing up to add multiple service centers and chargers in anticipation of the new model 3. I think we all agree that increased support staff and facilities will reduce our current anxieties, and I believe things are certainly better than they were during the first MS deliveries back in 2013. Its a steep hill, but we seem to be making the climb successfully.