My theory: It's only (or mainly) those who take a keen interest who complain, and very loudly, when they lose out on a new feature. So Tesla is throwing a bone to those people, but they are doing so more for their own benefit since dealing with those whiners is a hassle. Tesla wants to avoid this so they purposely leaked this, just like when I said they leaked AP2.0 purposely back in May:
New Tesla Model S Has 2nd Triple Cam For Autopilot & Pedestrian Noise Unit
The same applies here. Unfortunately, I don't think we will see the 100D until after January 1, 2017 (so no free SC) and probably more like March to May 2017. They tend to send the leak out about 4 - 6 months before availability, if my theory is true, and if history is any example.