After driving a P85 for almost 4 years, not sure that faster than 4.2 0-60 performance is worth much for normal driving. The P85 easily outpaces other vehicles in accelerating from a stop sign/stop light or when entering a freeway - and that's without using the full acceleration of the car.
In our next car, we want more range. The 90D would add another 30 rated miles of range. A P100D would add an additional 20 miles of range, but if we really aren't interested in the 2.4 0-60 performance, doesn't seem worth the extra $40K for only 20 miles more of range.
A great Christmas present would be for Tesla to start taking orders for the 100D in the next few days, and allow us to get it under the current supercharging policy...