There has been talk that the current set of sensors isn't adequate (which is why many Autopilot features have been delayed). Many X mules and even an S has been spotted with upgraded sensors (rear radar, additional cameras, etc.) I am hoping these will be on the X when it is released. There's no need to specifically mention a newer set of sensors in the Design Studio as they would probably be standard and only enabled if the Autopilot package is purchased.
Wild idea: Tesla gives up on autopilot for Model S, offers Model X with autopilot to anybody with Model S that has autopilot hardware and appropriate package that includes it, and takes back those Model S's with a superb trade in value to be resold CPO with advertising to used buyers that they will never have autopilot, and the marketplace gets a bunch of depreciated used Tesla cars on the road in the hands of happy poorer buyers that will take up some of the Model 3 demand, smoothing out the overall marketplace of Tesla model availability.