This is the same pattern Tesla has used before.
The first production cars were Signature - with all of the features selected - at the highest price. And then Tesla started producing the lower priced non-Signature cars. I received my P85 relatively quickly in early 2013, when they were selling the performance cars quicker than the lower priced, smaller battery, cars.
Tesla will continue to ramp up production of the 100 battery packs. And when they have enough production to support more than the P100D cars, we should expect they'll start introducing more 100 variants of the S and X.
Though, will they decide to completely replace the 90s with 100s, at about the same price point?
Or, will they decide to keep producing the 90 battery packs, and offer the 100s at a higher price point?
We're still planning to wait for a 100D with AP2.0 - and hopefully we'll see both soon...