Today, I received information from a Tesla source that there will be a single charger offered on the X, and that it will be a 60A charger instead of 40A. I was told that this was in part due to the fact that getting a charger in the back of the vehicle was difficult due to the 3rd row seating. I'm assuming it is also a nice compromise between 40A and 80A.
Just a rumor, but I have reason to believe this is valid information.